Firm support for committee in crisis? (5)
I believe the answer is:
cobra
'committee in crisis?' is the definition.
(Cabinet Office Briefing Room A - UK committee)
'firm support' is the wordplay.
'firm' becomes 'co' (abbreviation for company).
'support' becomes 'bra' (a support for the breasts).
'co'+'bra'='COBRA'
'for' is the link.
(Other definitions for cobra that I've seen before include "Poisoner" , "dangerous striker" , "hamadryad" , "Something with a hood" , "a king, for example" .)