I found this mostly straightforward.
The exceptions were blind spots for 10A, where the answer was obvious, but it took me a while to work out the wordplay; and more particularly 16A, where the answer was not clear to me for far too long.
Across | |||
1. | This grammatical unit’s length is within reason (6) | ||
CLAUSE | An envelope (‘within’) of L (‘length’) in CAUSE (‘reason’). | ||
4. | Glass boat (8) | ||
SCHOONER | Double definition. We had this word in yesterday’s Rufus. | ||
9. | Reach a river bend (6) | ||
ARRIVE | An anagram (‘bend’) of ‘a river’. | ||
10. | Up to the time of cutting support in prison (8) | ||
BASTILLE | An envelope (‘cutting’) of TILL (‘up to the time’) in BASE (‘support’). | ||
12. | Conceited artist retracted tirade over work sent back (8) | ||
ARROGANT | An envelope (‘over’) of OG, a reversal (‘sent back’) of GO (‘work’) in AR, a reversal (‘retracted’) of RA (‘artist’) plus RANT (‘tirade’). | ||
13. | In favour of putting on spelling contest at an earlier time (6) | ||
BEFORE | An envelope (‘putting on’) of FOR (‘in favour of’) in BEE (‘spelling contest’). | ||
15. | Leisure facility (4) | ||
EASE | Double definition. | ||
16. | It’s extremely beneficial to cover everything with glass (7) | ||
BALLOON | An envelope (‘to cover’) of ALL (‘everything’) in BOON (‘it’s extremely beneficial’), for a large wineglass or brandy snifter. | ||
20. | Grazing land beyond a river (7) | ||
PASTURE | A charade of PAST (‘beyond’) plus URE (‘a river’). | ||
21. | Blue feathers (4) | ||
DOWN | Double definition. | ||
25. | Right back crosses one to get a goal (6) | ||
TARGET | An envelope (‘crosses’) of A (‘one’) in TR, a reversal (back’) of RT (‘right’) plus ‘get’. | ||
26. | Set off for an appointment involving school (8) | ||
DETONATE | An envelope (‘involving’) of ETON (‘school’) in DATE (‘appointment’). | ||
28. | Herb is 12 amazingly (8) | ||
TARRAGON | An anagram (‘amazingly’) of ARROGANT, the answer to 12A. | ||
29. | A warning for Mark (6) | ||
NOTICE | Double definition. | ||
30. | Talk with the Head of Charterhouse about poetry (8) | ||
CONVERSE | A charade of C (‘head of Charterhouse’) plus ON (‘about’) plus VERSE (‘poetry’). | ||
31. | Leave dead trees all over the place (6) | ||
DESERT | A charade of D (‘dead’) plus ESERT, an anagram (‘allover the place’) of ‘trees’. | ||
Down | |||
1. | Absurd behaviour before Spurs’ opening game (8) | ||
CHARADES | A charade (what else?) of CHARADE (‘absurd behaviour’) plus S (‘Spurs opening’). | ||
2. | Improve the image of Belgium after broadcast on race (8) | ||
AIRBRUSH | A charade of AIR (‘broadcast’) plus B (‘Belgium’, IVR) plus RUSH (‘race’). | ||
3. | Wild goat oddly raised in keep (6) | ||
SAVAGE | An envelope (‘in’) of AG, a reversal (‘raised’ in a down clue) in SAVE (‘keep’). | ||
5. | Talk about those who volunteer after church (4) | ||
CHAT | A charade of CH (‘church’) plus AT, a reversal (‘about’) of TA (‘those who volunteer’). | ||
6. | Not surprisingly he gets hit at exactly the arranged time (2,3,3) | ||
ON THE DOT | A charade of ONT, an anagram (‘surprisingly’) of ‘not’ plus ‘he’ plus DOT (‘hit’). | ||
7. | Sailor discovered in a hold (6) | ||
NELSON | Double definition. | ||
8. | Staggered by revolutionary capturing general in retreat (6) | ||
REELED | An envelope (‘capturing’) of EEL, a reversal (‘in retreat’) of LEE (Robert E, ‘general’) in RED (‘revolutionary’). | ||
11. | Dig up body part during organised hunt (7) | ||
UNEARTH | An envelope (‘during’) of EAR (‘body part’) in UNTH, an anagram (‘organised’) of ‘hunt’. | ||
14. | In a panic when Capone approaches carrying a gun (7) | ||
ALARMED | A charade of AL (‘Capone’) plus ARMED (‘carrying a gun’). | ||
17. | Cut material at speed (8) | ||
LACERATE | A charade of LACE (‘material’) plus RATE (‘speed’). | ||
18. | It’s used in calling for the return of Peron caught earlier on the outskirts of Valparaiso (8) | ||
VOCATIVE | A charade of VO (‘the outskirts of ValparisO‘) plus C (‘caught’) plus ATIVE, a reversal (‘the return of’) of EVITA (‘Peron’). | ||
19. | Benefit from a hobby (8) | ||
INTEREST | Double definition. | ||
22. | Still with French film star in South Carolina (6) | ||
STATIC | An envelope (‘in’) of TATI (Jacques, ‘French film star’) in SC (‘South Carolina’). | ||
23. | Finished speaking about lines by king in rehearsal (3,3) | ||
DRY RUN | An envelope (‘about’) of RY (railway ‘lines’) plus R (‘king’) in DUN, a homophone (‘speaking’) of DONE (‘finished’). | ||
24. | Sullen fictional detective embracing love (6) | ||
MOROSE | An envelope (’embracing’) of O (‘love’) in MORSE (‘fictional detective’). | ||
27. | Abraham’s nephew initially struck a great deal (4) | ||
LOTS | A charade of LOT (‘Abraham’s nephew’) plus S (‘initially Struck’). |
Although it did tend towards the chestnutty side of clue/solution, I did enjoy myself so thank you Peto and PeterO.