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Withhold information - about an increase in the premium? (5,2)

Ross

I believe the answer is:

cover up

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

'withhold information' is the definition.
(I've seen this before)

'about an increase in the premium?' is the wordplay.
I cannot quite see how this works, but
'about' could be 'over' (both can mean around) and 'over' is located in the answer.
'increase' could be 'up' (upping is a kind of increasing) and 'up' is located in the answer.
A single letter 'c' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for cover up that I've seen before include "Attempt at concealment" , "Withhold information" , "cost of insurance has risen" , "Conceal" , "whitewash" .)

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