Crossword Genius

Grounds for development? (5)

Ross

I believe the answer is:

sites

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

'grounds' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sites that I've seen before include "internet locations" , "Spots" , "Locations or positions, as for building" , "places" , "Is set (anag)" .)

I've seen this clue in The Globe and Mail.
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