Crossword Genius

Firm pressure on lawman (3)

Ross

I believe the answer is:

cop

'lawman' is the definition.
(cop is a kind of lawman)

'firm pressure on' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'pressure' becomes 'p' (scientific abbreviation).
'on' is a charade indicator (letters next to each other).
'co'+'p'='COP'

(Other definitions for cop that I've seen before include "Policeman (informal)" , "Short policeman" , "Police officer (slang)" , "catch" , "Policeman (slang)" .)

I've seen this clue in The Mirror.
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