Crossword Genius

Forms part of this puzzle's theme? (6)

Ross

I believe the answer is:

shapes

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

'forms' is the definition.
(I know this)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for shapes that I've seen before include "Forms, outlines" , "Casts or moulds" , "10, 17 and 22, for example" , "models" , "Oblong and square, say" .)

I've seen this clue in the Sydney Morning Herald.
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