Crossword Genius

Cast may need this, seeing a part rewritten (11*)


I believe the answer is:

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

'cast may need this' is the definition.
The definition suggests a singular noun which matches the answer.

'seeing a part rewritten' is the wordplay.
'rewritten' indicates anagramming the letters.
'seeingapart' is an anagram of 'GREASE PAINT'.

Can you help me to learn more?

(Other definitions for grease paint that I've seen before include "Theatrical make-up", "Actor's make-up".)

I've seen this clue in The Telegraph.