Crossword Genius

Its object is to encourage capital growth (4,5)

Ross

I believe the answer is:

hair tonic

I'm a little stuck... Click here to teach me more about this clue!

'its' is the definition.
I can't tell whether this defines the answer.

'object is to encourage capital growth' is the wordplay.
I cannot really understand how this works, but
'object' could be 'tonic' (tonic is a kind of object) and 'tonic' is located in the answer.
'capital' could be 'ai' (resembles 'A1', old-fashioned term for excellent) and 'ai' is located in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Globe and Mail.
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