Tries to present a bit of thrush as agony (3,1,2)

I believe the answer is:

has a go

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'tries to present a bit' is the definition.
I know nothing about this answer so I can't tell whether this works.

'of thrush as agony' is the wordplay.
'of' indicates the answer is hidden within the clue.
'HAS A GO' can be found hidden inside 'thrush as agony'.

Can you help me to learn more?

(Other definitions for has a go that I've seen before include "Attempts to stop a criminal" , "In modern jargon, makes an effort, gives it a shot" , "Confronts criminal" .)

I've seen this clue in The Guardian.

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