Unusual phrase over page, maybe (7)
I believe the answer is:
perhaps
'maybe' is the definition.
('perhaps' can be a synonym of 'maybe')
'unusual phrase over page' is the wordplay.
'unusual' indicates an anagram.
'over' is an insertion indicator.
'page' becomes 'p'.
'phrase' anagrammed gives 'perhas'.
'perhas' placed around 'p' is 'PERHAPS'.
(Other definitions for perhaps that I've seen before include "say" , "Quite possibly" , "Not necessarily" , "Conceivably" , "Could be, maybe" .)