Enemy froze, oddly (3)
I believe the answer is:
foe
'enemy' is the definition.
(synonyms)
'froze oddly' is the wordplay.
'oddly' indicates alternate letters (letters in odd-numbered positions).
The alternate letters of 'froze' are 'FOE'.
(Other definitions for foe that I've seen before include "friend never!" , "Someone opposing" , "Opponent" , "Environmentalists" , "Antagonist" .)