Crossword Genius

Cast in flop aspires to get art therapy (7,2,5)

Ross

I believe the answer is:

plaster of paris

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

'cast' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for plaster of paris that I've seen before include "What might make cast" , "material for cast" , "is needed for the cast?" .)

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