Crossword Genius

Minor member of cast often subject to examination (10)

Ross

I believe the answer is:

understudy

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

'minor member of cast often' is the definition.
I can't tell whether this defines the answer.

'subject to examination' is the wordplay.
'subject to' becomes 'under' (being subject to a law is being under it).
'examination' becomes 'study' (study is a kind of examination).
'under'+'study'='UNDERSTUDY'

Can you help me to learn more?

(Other definitions for understudy that I've seen before include "one covers part" , "Replacement" , "emergency role" , "One prepared to take over from leading actor" , "reserve?" .)

I've seen this clue in The Independent.
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