Crossword Genius

Only parts of areas? (4)

Ross

I believe the answer is:

ares

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'areas?' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

'only parts' is the wordplay.
'only' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'parts' becomes 'res' (re is a kind of part).
'a'+'res'='ARES'

'of' acts as a link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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