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Actress to feel bad about taking off a dress — nothing to finish with! (5,5)

Ross

I believe the answer is:

greta garbo

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

'actress' is the definition.
(I've seen this before)

'to feel bad about taking off a dress nothing to finish with' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' (regarding) and 're' is found in the answer.
'a' is within the answer.
'dress' could be 'garb' (synonyms) and 'garb' is present in the answer.
'to' is present in the answer.
A single letter 'g' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for greta garbo that I've seen before include "Old actress" , "See actress" .)

I've seen this clue in The Times.
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