White brandy is in per cent over (5)

'white brandy' is the definition.
(type of brandy)

'is in per cent over' is the wordplay.
I cannot really see how this works, but
'is' is found in the answer.
'cent' could be 'c' and 'c' is located in the answer.
'over' could be 'o' (cricket abbreviation) and 'o' is located in the answer.
A single letter 'p' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?