Crossword Genius

Theatre stars admitted to donning very little (2,4)

Ross

I believe the answer is:

at rest

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

'very little' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'theatre stars admitted to donning' is the wordplay.
'AT REST' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for at rest that I've seen before include "In relaxed state, perhaps dead" , "calm" , "Treats (anag.)" , "Immobile" , "Not moving, free from anxiety" .)

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