A wonderful selection of previously unknown words amongst the answers
ACROSS
1 German certainly recalled China as source of purgative JALAP german yes JA + china PAL<
5 Mark in text: bar, beside turned-over edge CROW bar after LIP<
10 Copper’s arrest featuring in example of composite old books INCUNABULA (CU NAB) in INULA
11 Opinion totally gutted house-husband BETTY BET + TotallY
12 In some places once acting’s a long time forgotten ONST ON ST{age}
15 A company invested in favourite historic naval gear PEA COAT (A CO) in PEAT obsolete for favourite
16 Duck eggs? Call back chasing information regarding egg production OOGENETIC OO GEN (CITE)<
17 Excessive clothing? Paramour taking top off with relish OVERDRESSING {l}OVER DRESSING
20 Not know when to stop,say, treating patient with mucus MISPUNCTUATE (PATIENT MUCUS))*
23 Review one movement that’s in distress CRITICISE (I TIC) in CRISE
24 Rum store running short, reforming drinkers being round about CACHACA rum CACH{e} C in AA alcoholics anonymous
26 Leonardo’s last to sign print OLEO O LEO zodiac sign (this meaning not in Chambers)
27 Malaysian state has rejected admitting British Airways SABAH BA in HAS<
28 Make refined arrangement of ten elegies GENTEELISE (TEN ELEGIES)*
29 Stump? Stumped and confused? STADDLE ST cricket ADDLE
30 Exercises – yes , exercising – will do for weight,as before PEYSE PE (YES)*
DOWN
1 Taunt curtailed with success shown by canvas support JIB BOOM nautical JIB BOOM
2 Describing respiratory infections and/or vile spasms besetting one ADENOVIRAL (AND OR VILE A)* not in Chambers as adjective
3 Quantity of US beer, mostly low-alcohol LITE LITE{r}
4 A new cuckoo observed in European city ANTWERP A N TWERP
5 One with questions over money (bread) PUMPERNICKEL PUMPER NICKEL
6 Animated debate with client not readily observed INDETECTABLE (DEBATE CLIENT)*
7 Buddhist obscurity about one in non-priestly surroundings LAMAISTIC (A in MIST) in LAIC
8 Gangster writer not unknown to keep talking RUN ON american author damon RUN{y}ON
9 Hymn-writer is no longer accommodating teetotaller WATTS TT in WAS
13 Aren’t son and daughter involved in speeches for commemorations? SAINT’S DAYS (AINT S D) in SAYS
14 Indian university regarded as insensitive INDURATED IND U RATED
18 Enzyme certain to contain carbon and arsenic, variously SUCRASE (C and then AS) in SURE sucrase = invertase
19 Rural American to get on well and happily? Not half GEECHEE GEE CHEE{rily)
21 Shelters old cheat on board SCOGS COG in SS
22 Soprano and contralto elevated one from Macbeth? SCENA S C ANE<
25 The old man turned up to follow OBEY (YE BO)<
( )* = anagram < = reverse { } = omit