Crossword Genius

Try to tackle criminal? (4,1,2)

Ross

I believe the answer is:

have a go

I believe this is a double definition.

'try' is the first definition.
(to have a go is to make an attempt)

'tackle criminal?' is the second definition.
(I've seen this before)

'to' acts as a link.

(Other definitions for have a go that I've seen before include "Take a turn" , "Make an attempt" , "Words of encouragement" , "Tackle criminal" , "Intervening to stop a criminal (colloq,)" .)

I've seen this clue in The Sun.
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