No 13808, Thursday 09 Mar 2023, Arden

Solution to 29A has been deliberately left unsolved and is to be answered only by a non-regular / novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.

ACROSS

1   Cryptic clue - attends to one who is young at heart (11) ADULTESCENT*

7   It's worn on top of the head but can go under the feet when turned around (3) TAM<=

9   Top meal, no starter (5) UPPER sUPPER

10 Six in list refused - will accept nothing but a musician (9) VIOLINIST {VI}{IN+LIST}* over {0}

11 Study on wear - transforming boy to girl (9) TRIBOLOGY*

12 Talk on land (5) GABON {GAB}{ON}

13 Animal on horseback came to this place - Did you hear that? (3,4) ROE DEER (~ rode here)

15 Wrestling with maths problem, ending in zero (4) SUMO [SUM}{0}

18 Turn turtle soup (4) LEEK<= Defintion incorrect. Leek is a vegetable from which soup vcan be made and not just Soup.

20 Just behind an ex. PM in London (7) MAYFAIR {FAIR}<=>{MAY}

23 Reject ugly things like stubble (5) STRAW<=

24 Horoscope covers fate - die finally in US city (9) CHARLOTTE {CHAR{LOT}T}{diE}

26 Borders on mostly set individualistic ideas - Mike supports such religious belief (9) MYSTICISM {Mo..lY}{SeT}{In...iC}{IdeaS}{M}

27 Old man crosses border first (5) PRIMA {P{RIM}A}

28 Strive to get 50% of the capital (3) VIE VIEnna

29 Bit of overreach to shift a beam (6,5) S?A?C? L?G?T (Addendum - SEARCH LIGHT {S{REACH*}LIGHT} - See comments) 

DOWN

1   A line around midfield means playing the field (8) ADULTERY {ADULT}{fiEld}{RY}

2   Single one in Paris - united in support (8) UNPAIRED {UN}{PAIRED}

3   Approximately under top of tree trunk (5) TORSO {OR SO}<=>{Tree}

4   Enjoy sipping one with the guardian angel (7) SAVIOUR {SAV{1}OUR}

5   Hertz and Ampere perhaps spy on me strangely (7) EPONYMS*

6   Flowing yet sticky, what is it? (9) THINGUMMY {THIN}{GUMMY}

7   Attempt to collect one pound - it often goes to one's head (6) TRILBY {TR{1}{LB}Y}

8   Service mats, take home (6) MATINS {MAT{IN}S}

14 Last one was in front, now back with us - is saxifrage beginning to flower? (9) EDELWEISS {onE}{LED<=}{WE}{IS}{Sa...e}

16 Remote object is not much valued (8) FARTHING {FAR}{THING}

17 Ex President exposed - truth is man made (8) ARTEFACT {cARTEr}{FACT}

19 Spirit of weekend, a country follows (7) KACHINA {weeK}{A}{CHINA}

20 Ape's got a small rank (7) MIASMIC {MI{A}{S}MIC}

21 Entry permit rejected, takes a second for a writer (6) ASIMOV {ASI{MO}V<=}

22 Fish relocated right into the water in Rhine (6) WRASSE W(+r)RASSE(-r)

25 Revers copy in between lines (5) LAPEL {L}{APE}{L}

Reference List

Talk = GAB, Mike = M, A = ADULT, Line = RY, One in French = UN, Home = IN, Small = S, A second = MO, Right = R, Line = L