Crossword Genius

Proficient fighter for contentious building site (9)

Ross

I believe the answer is:

greenbelt

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

'proficient fighter for contentious' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'site' is the wordplay.
I cannot quite see how this works, but
'site' could be 'green' (green is a kind of site) and 'green' is found within the answer.
The remaining letters 'belt' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'building' acts as a link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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