Crossword Genius

Unexpectedly find gamble working (6,2)

Ross

I believe the answer is:

chance on

'unexpectedly find' is the definition.

'gamble working' is the wordplay.
'gamble' becomes 'chance' (synonyms).
'working' becomes 'on'.
'chance'+'on'='CHANCE ON'

(Other definitions for chance on that I've seen before include "Find (something) by accident" , "Happen to find, come upon" .)

I've seen this clue in The Times.
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