Firm female support for lethal Asian striker (5)
I believe the answer is:
cobra
'lethal asian striker' is the definition.
(venomous snake)
'firm female support' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'female support' becomes 'bra' (underwear worn by a woman).
'co'+'bra'='COBRA'
'for' is the link.
(Other definitions for cobra that I've seen before include "Hooded ophidian" , "Poisoner" , "Highly venomous hooded reptile" , "Venomous hooded snake" , "Poisonous snake" .)