Officer in twilled fabric meeting social worker (8)
I believe the answer is:
sergeant
'officer' is the definition.
(sergeant is a kind of officer)
'twilled fabric meeting social worker' is the wordplay.
'twilled fabric' becomes 'serge' (I've seen this before).
'meeting' means one lot of letters go next to another.
'social worker' becomes 'ant' (I've seen this before).
'serge'+'ant'='SERGEANT'
'in' acts as a link.
(Other definitions for sergeant that I've seen before include "NCO; Death a fell one, Hamlet" , "Reagents for army NCO" , "CARRY ON FILM" , "one with stripes" , "officer of the law" .)