Crossword Genius

Pieces of land one reserves (4)

Ross

I believe the answer is:

ares

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'pieces of land' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'one reserves' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'reserves' becomes 'res' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'res'='ARES'

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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