Crossword Genius

Time to fight? (5)

Ross

I believe the answer is:

enemy

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'time' is the first definition.
(I've seen this before)

'fight?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'to' is the link.

Can you help me to learn more?

(Other definitions for enemy that I've seen before include "one in opposition" , "Yemen (anag.)" , "Hostile opponent" , "Opposing force" , "Rival" .)

I've seen this clue in The Guardian.
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