Society playwright clothes son for single woman (8)
I believe the answer is:
spinster
'single woman' is the definition.
(I've seen this before)
'society playwright clothes son' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'playwright' becomes 'pinter' (Harold Pinter).
'clothes' indicates putting letters inside.
'son' becomes 's'.
'pinter' placed around 's' is 'pinster'.
's'+'pinster'='SPINSTER'
'for' is the link.
(Other definitions for spinster that I've seen before include "Unmarried older woman" , "woman like Miss Havisham" , "old maid, perhaps" , "She never married" , "matchless female" .)