Crook did try and go for treatment (5,3)

I believe the answer is:

dirty dog

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'treatment' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'crook did try and go' is the wordplay.
'crook' is an anagram indicator (a crooked version of the letters).
'and' means one lot of letters go next to another.
'did'+'try'='didtry'
'didtry' put after 'go' is 'godidtry'.
'godidtry' anagrammed gives 'DIRTY DOG'.

'for' is the link.

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I've seen this clue in The Independent.

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