Want for activity in the nude? (4,7,2)

Ross

I believe the answer is:

have nothing on

This clue is a double definition.

'want for activity' is the first definition.
(to have nothing on is to have nothing to do)

'in the nude?' is the second definition.
(to have nothing on can mean to have no clothes on)

(Other definitions for have nothing on that I've seen before include "being out of gear?" , "Be free" , "Lack engagement" , "like Gypsy Rose Lee ultimately" , "Be uncommitted" .)

I've seen this clue in The Times.

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