Secret agent praise stage make-up? (11)

I believe the answer is:

greasepaint

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

'make-up?' is the definition.
(I've seen this before)

'secret agent praise stage' is the wordplay.
'agent praise' anagrams to 'GREASEPAINT'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for greasepaint that I've seen before include "What actor wears" , "Essence of theatrical life" , "Players smear this on" , "Theatrical make-up" , "this is applied, in the theatre" .)

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

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