Half-naked, as Alf naked? (7)

Ross

I believe the answer is:

topless

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'half-naked' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for topless that I've seen before include "Wearing no clothing above the waist" , "As a Page Three girl?" , "Bare from the waist up" , "Half-naked" , "Leaving the breasts uncovered" .)

I've seen this clue in The Times.

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