Locates on behalf of and allows one to win the case (5,3)

I believe the answer is:

finds for

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'allows one to win the case' is the definition.
I can't judge whether this definition defines the answer.

'locates on behalf of' is the wordplay.
'locates' becomes 'finds' (I've seen this in another clue).
'on behalf of' becomes 'for' (eg speaking on behalf of or for someone else).
'finds'+'for'='FINDS FOR'

'and' acts as a link.

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I've seen this clue in the Evening Standard.

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