Carol sells shifts resembling T-shirts? (10)

I believe the answer is:

collarless

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'resembling t-shirts?' is the definition.
I can't judge whether this defines the answer.

'carol sells shifts' is the wordplay.
'shifts' indicates an anagram.
'carol'+'sells'='carolsells'
'carolsells' anagrammed gives 'COLLARLESS'.

Can you help me to learn more?

(Other definitions for collarless that I've seen before include "Wearing a T-shirt, perhaps" , "unable to take the lead?" .)

I've seen this clue in The Independent.

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