Pressure on chaps to wear quite fancy clobber (9)
I believe the answer is:
equipment
'clobber' is the definition.
(thesaurus)
'pressure on chaps to wear quite fancy' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'on' is a charade indicator (letters next to each other).
'chaps' becomes 'men' (I've seen this before).
'to wear' means one lot of letters goes inside another.
'fancy' indicates an anagram.
'p'+'men'='pmen'
'quite' is an anagram of 'equit'.
'pmen' inserted within 'equit' is 'EQUIPMENT'.
(Other definitions for equipment that I've seen before include "Set of instruments that perform a service" , "Apparatus, gear" , "Kit, apparatus" , "fitting" , "Apparatus, tools" .)