Look on page two (4)
I believe the answer is:
pair
'two' is the definition.
(pair is a kind of two)
'look on page' is the wordplay.
'look' becomes 'air' (something might have a certain air or look).
'on' is a charade indicator (letters next to each other).
'page' becomes 'p'.
'air' put after 'p' is 'PAIR'.
(Other definitions for pair that I've seen before include "Husband and wife" , "E.g. two aces; mate" , "Duo" , "Brace, couple" , "Put together - two of a kind" .)