Crossword Genius

Sphere, yes; but it's often rectangular (5)

Ross

I believe the answer is:

field

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

'sphere' is the definition.
(I know that sphere can be written as field)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for field that I've seen before include "Crop land; catch (ball)" , "Games area" , "his nocturnes, perhaps?" , "Pitch" , "Enclosed piece of land or area of endeavour" .)

I've seen this clue in the Evening Standard.
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