Crossword Genius

Green building, perimeter walls half painted (8)

Ross

I believe the answer is:

ecolodge

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

'perimeter walls half painted' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'green building' is the wordplay.
'green' becomes 'eco' (abbreviation for ecological).
'building' becomes 'lodge' (lodge is a kind of building).
'eco'+'lodge'='ECOLODGE'

Can you help me to learn more?

(Another definition for ecolodge that I've seen is " Greenhouse, say".)

I've seen this clue in The Independent.
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