Page awfully errant colleague (7)
I believe the answer is:
partner
'colleague' is the definition.
(I've seen this before)
'page awfully errant' is the wordplay.
'page' becomes 'p'.
'awfully' indicates an anagram.
'errant' anagrammed gives 'artner'.
'p'+'artner'='PARTNER'
(Other definitions for partner that I've seen before include "One of a married couple" , "Comrade" , "Accomplice" , "Companion at bridge, dance, or home" , "Either one of a couple" .)