Who sells clothes available in better shape (9)

I believe the answer is:

outfitter

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'who sells clothes' is the definition.
I can't judge whether this definition defines the answer.

'available in better shape' is the wordplay.
'available' becomes 'out' (as in a product which is out).
'in better shape' becomes 'fitter' (I've seen this before).
'out'+'fitter'='OUTFITTER'

Can you help me to learn more?

(Other definitions for outfitter that I've seen before include "Supplier" , "Person in shop" , "One supplies gear" , "Seller of clothes" , "Men's clothing shop" .)

I've seen this clue in The Times.

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