Withdrawing part of uptight aesthete in Bottom (4)
I believe the answer is:
seat
'bottom' is the definition.
(synonyms)
'withdrawing part of uptight aesthete' is the wordplay.
'withdrawing' shows that the letters should be reversed in order.
'part of' indicates a hidden word.
'taes' can be found hidden inside 'uptight aesthete'.
'taes' backwards is 'SEAT'.
'in' acts as a link.
(Other definitions for seat that I've seen before include "Chair, bench, saddle, etc" , "Position (in parliament)" , "Chair, bench, or stool, say" , "Spanish car" , "Box ---, position of advantage" .)