Crossword Genius

Firm, small lettuce (3)

Ross

I believe the answer is:

cos

'lettuce' is the definition.
(cos lettuce is a kind of lettuce)

'firm small' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'small' becomes 's' (abbreviation - e.g. clothes size).
'co'+'s'='COS'

(Other definitions for cos that I've seen before include "Greek island and type of lettuce" , "Salad ingredient" , "vegetable?" , "Greek island (alternative spelling): Trig abbrev!" , "often associated with sin" .)

I've seen this clue in The Times.
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