Firm female garment, one with hood (5)
I believe the answer is:
cobra
'one with hood' is the definition.
(I've seen this before)
'firm female garment' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'female garment' becomes 'bra'.
'co'+'bra'='COBRA'
(Other definitions for cobra that I've seen before include "hamadryad" , "Poisonous snake" , "crisis response group" , "dangerous striker" , "Hooded snake - AC model of old sports car" .)