Crossword Genius

Sinuous creature's firm support (5)

Ross

I believe the answer is:

cobra

'sinuous creature's' is the definition.
(I've seen this before)

'firm support' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'support' becomes 'bra' (a support for the breasts).
'co'+'bra'='COBRA'

(Other definitions for cobra that I've seen before include "Sinuous creature" , "Hooded snake - AC model of old sports car" , "Something with a hood" , "venomous type" , "Venomous hooded snake" .)

I've seen this clue in The Sun.
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