The puzzle may be found at https://www.theguardian.com/crosswords/cryptic/29834.
I started off at a fast pace with much of the upper half, slowed down below, and finally came to a screeching halt with 11A COMPONENT.
| ACROSS | ||
| 1 | ATROCIOUS |
Horrible US car I too exchanged (9)
|
| An anagram (‘exchanged’) of ‘US car I too’. | ||
| 6 | LENS |
What one needs to see clearly in European city (4)
|
| Double definition; the ‘European city’ is in France, although there are municipalities of the same name in Belgium and Switzerland. | ||
| 10 | SCOUR |
Briefly scrub middle of pot vigorously? (5)
|
| An anagram (‘vigorously’) of ‘scru[b]’ minus its last letter (‘briefly’) plus O (‘middle of pOt’) with an &lit definition.. | ||
| 11 | COMPONENT |
Part of short quiz, perhaps about medical speciality (9)
|
| Over to you: I cannot see any justifiable wordplay – at a stretch, CONT[est] might be a ‘short quiz perhaps’, but the envelope contents tell me nothing. | ||
| 12 | SET MENU |
Little choice in this as soldiers arrange uniform clothes (3,4)
|
| An envelope (‘clothes’) of MEN (‘soldiers’) in SET (‘arrange’) plus U (‘uniform’). | ||
| 13 | LASAGNE |
Way to give in and make pasta (7)
|
| An envelope (‘in’) of SAG (‘give’) in LANE (‘way’). | ||
| 14 | INDISPENSABLE |
Inside damage hampers prison’s key (13)
|
| An envelope (‘hampers’) of PEN’S (‘prison’s’) in IN (‘inside’) plus DISABLE (‘damage’). | ||
| 17 | AUDITORY CANAL |
Knock out any radical listening 11 (8,5)
|
| An anagram (‘knock’) of ‘out any radical’; ’11’ is COMPONENT, the answer to 11A. | ||
| 21 | GLACIER |
Slippery creeper in German city colder after opening shed (7)
|
| A charade of G (‘German’) plus LA (‘city’) plus [i]CIER (‘colder’) minus its first letter (‘after opening shed’). | ||
| 22 | SURNAME |
Appellation of South American country that’s not independent (7)
|
| A subtraction: SUR[i]NAME (‘South American country’) minus the I (‘that’s niot independent’). | ||
| 24 | ITINERANT |
Travelling author is reportedly expressing anger about temperature (9)
|
| An envelope (‘about’) of T (the first one, ‘temperature’) in I (the ‘author’ of the clue) plus INERANT, sounding like (‘reportedly’) IN A RANT (‘expressing anger’). | ||
| 25 | DHOBI |
Asian cleaner content to mend hob initially (5)
|
| A hidden answer (‘content to’) in ‘menD HOB Initially’. An Indian washerman. | ||
| 26 | MEET |
Bee has to swarm around (4)
|
| A reversal (‘around’) of TEEM (‘swarm’). | ||
| 27 | SPEARHEAD |
Lead weapon with tip (9)
|
| A charade of SPEAR (‘weapon’) plus HEAD (‘tip’). | ||
| DOWN | ||
| 1 | ASSASSIN |
Butcher two turkeys at home (8)
|
| A charade of ASS ASS (‘two turkeys’) plus IN (‘at home’). | ||
| 2 | ROOST |
Son’s in bottom bed (5)
|
| An envelope (‘in’) of S (‘son’) in ROOT (‘bottom’). | ||
| 3 | CAREERS ADVISER |
One helping pupils to see arrives unexpectedly with card (7,7)
|
| An anagram (‘unepectedly’) of ‘see arrives’ plus ‘card’. | ||
| 4 | OCCLUDE |
Stop officer speaking as represented here (7)
|
| A charade of OC (‘officer’ commanding) plus CLUDE, sounding like (‘speaking’) CLUED (‘as represented here’). | ||
| 5 | SAMPLES |
Models showing more than enough onboard (7)
|
| ‘Onboard’ needs to be read as IN A SHIP: an envelope (IN) of AMPLE (‘more than enough’) in SS (A SHIP). | ||
| 7 | EVERGREEN |
Fancy veneer over work unit is remaining fresh (9)
|
| An envlope (‘over’) of ERG (‘work unit’) in EVREEN, an anagram (‘fancy’) of ‘veneer’. | ||
| 8 | SETTER |
Maybe Kite’s sun gel (6)
|
| Triple definition. | ||
| 9 | HORSEBACK RIDER |
One who got up and chaired brokers’ assembly (9,5)
|
| An anagram (‘assembly’) of ‘chaired brokers’). | ||
| 15 | DRAMATISE |
Short, dull artist leaving one section for stage (9)
|
| A charade of DRA[b] (‘dull’) minus its last letter (‘short’) plus MATIS[s]E (‘artist’) minus an S (‘leaving one section’). | ||
| 16 | BLUEBIRD |
American winger from United blocking lively dribble (8)
|
| An envelope (‘blocking’) of U (‘United’) in BLEBIRD, an anagram (‘lively’) of ‘dribble’). | ||
| 18 | THREADS |
Goes through the unfinished books (7)
|
| A charade of ‘th[e]’ minus its last letter (‘unfinished’) plus READS (‘books’, noun). | ||
| 19 | ROSETTE |
Brunettes originally turned up, embracing prize (7)
|
| A reversed (‘turned up’ in a down light) hidden (’embracing’) answer in ‘brunETTES ORiginally’). | ||
| 20 | AGEISM |
Kinky male geisha not happy at first produces discrimination (6)
|
| An anagram (‘kinky’) of M (‘male’) plus ‘geis[h]a’ minus the H (‘not Happy at first’). | ||
| 23 | ADORE |
A pronounced opportunity for love (5)
|
| A charade of ‘a’ plus DORE, sounding like (”pronounced’) DOOR (‘opportunuty’), | ||

Re: COMPONENT I had trouble too. OneLook says COMPos are “Examinations assessing students’ academic knowledge”, which would do for quiz, plus ON for about, plus Ear, Nose and Throat. That’s the best I can do.
Spent a while trying to justify AMORE until I saw ADORE. The rest went in without too much difficulty.
LENS struck a chord because I just had a new one fitted this morning (cataract surgery).
Tx
11a Comp ( competition) on ear nose and throat ent?
11 a Comp on ent ( ear nose and throat) ?
COMPONENT
I had the same parse as Dr.WhatsOn@1, but Kirsty’s’s @2 seems plausible as well.
I parsed as did Kirsty.
Meet/bee was a head scratch.
Quite a workout and a very tricky one too.As everyone ,i too can’t figure out COMPONENT.Re:clue 8d,is SETTER a colloquial term for sun?
26 took an age to parse, last word in the clue was of course where I should have been looking,
Dolt I am!
11a, COMPetition-ON(about)-ENT(ear nose & throat) ‘Part’
For 11a I had Comp (common abbreviation of Complementary Exam, one held in special circumstances) on ENT, giving COMPONENT
Very taken with the definition for GLACIER, DRAMATISE made me laugh and ROSETTE is nicely hidden.
I agree with those seeing COMP as the ‘short quiz’, followed by ON and ENT: I have heard people talk of ‘comping magazines’ which contain loads of quizzes etc and Chambers gives comp /komp/ (informal)
noun
A compositor
An accompanist
A competition
A complimentary ticket, etc
A comprehensive school
intransitive verb
To work as a compositor
To play an accompaniment
To enter competitions in newspapers, magazines, etc
comˈper noun
A person who regularly enters competitions
Thanks both
Jay dee @6, the sun is a setter because each evening it sets. A cryptic crossword old chestnut, along the lines of flower for river …
BLUEBIRD 😊
James@13 as in a sewing bee or a spelling bee.