Crossword Genius

Contracts benefit trainer Waterhouse (3)

Ross

I believe the answer is:

gai

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'trainer waterhouse' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'contracts benefit' is the wordplay.
'contracts' means to remove the last letter (I've seen 'contracted' mean this (to contract is to shorten)).
'benefit' becomes 'gain' (synonyms).
'gain' with its last letter removed is 'GAI'.

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I've seen this clue in the Sydney Morning Herald.
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