Crossword Genius

Try very hard (4,1,3)

Ross

I think it could be either:

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6

4,1,3

bust a gut

'try very hard' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for bust a gut that I've seen before include "Really work extra hard" , "meet qualification for intestinal surgery?" , "Make a strenuous effort" , "Strain" , "Work extra hard to achieve something" .)

I've seen this clue in The Sunday Times.
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