Crossword Genius

Make firm but possibly get thin (7)

Ross

I believe the answer is:

tighten

'make firm' is the definition.
(tighten can mean to make firm or hard)

'possibly get thin' is the wordplay.
'possibly' indicates anagramming the letters.
'get'+'thin'='getthin'
'getthin' is an anagram of 'TIGHTEN'.

'but' acts as a link.

(Other definitions for tighten that I've seen before include "Make harder to undo" , "contract" , "Apply increased tension or security" , "To improve focus" , "Constrict" .)

I've seen this clue in the Sydney Morning Herald.
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