Colossus 285 UK STINKER

No ideas for 105a or 266a but think the others are
232a canoes buoyancy chamber (SP?N???) SPONSON
226a plants from foreign lands (E???I?S) EXOTICS, perhaps
276a abstained (from) (??C?E?E?) ESCHEWED

Thank you Imur, your words fit very nicely, the answer for 276a is something l have never seen before, thank you.l will just have to try and plod on with the remaining 2 clues l have to answer.

l am having real trouble trying to find a answer to 105a Adulate, l just cannot seem to find an anwser to fit, it could be EXTOL, but from my searches l cannot find an answer. Also having problems with clue 263a Motif,my letters areT?OPE could TROPE be the answer?, would appreciate some help. Thank you.

I think EXTOL and TROPE are right.

Thank you Cherrie, l have finally completed the grid. The word l needed for105a was in fact EXALT, so with these letters l found the clue for 98d coax was in fact CAJOLE, then l checked 92d languid again and with the last letter of exalt, the word l needed was LISTLESS not lifeless as l had previously had. Thank you for your help enabling me to finish what to me has been as real STINKER, it made me feel really rotten because l could not finish, but now l have, so only have to finish the baffler then l am finally done. Will go and do some starcross to calm myself down. Many thanks once again.