Crossword Genius

Be ambitious and claim 60% will be retained, though it's over what's expected (3,4)

Ross

I believe the answer is:

aim high

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'60% will be retained though it's over what's expected' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'be ambitious and claim' is the wordplay.
'be ambitious' becomes 'aim' (I've seen this in another clue).
'and' means one lot of letters go next to another.
'claim' becomes 'high' (I am not sure about this - if you are sure you should believe this answer much more).
'aim'+'high'='AIM HIGH'

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I've seen this clue in The Irish Times.
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