Man sees sports as one (2,5)
I believe the answer is:
en masse
'as one' is the definition.
(both can mean as a group)
'man sees sports' is the wordplay.
'sports' indicates an anagram (I've seen 'sporting' mean this).
'man'+'sees'='mansees'
'mansees' anagrammed gives 'EN MASSE'.
(Other definitions for en masse that I've seen before include "Many as one" , "As a body (Fr.)" , "All together - in France (2.5)" , "in concert" , "All together (Fr.)" .)