Crossword Genius

Units forming a reserve (4)

Ross

I believe the answer is:

ares

'units' is the definition.
(are is a kind of unit)

'a reserve' is the wordplay.
'reserve' becomes 'res' (I've seen this in other clues).
'a'+'res'='ARES'

'forming' acts as a link.

(Other definitions for ares that I've seen before include "Belligerent god" , "Greek god of war" , "Olympian" , "War-god" , "figure of worship" .)

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