Crossword Genius

Shopkeeper who’s behaving as though he were a doctor? (6)

Ross

I believe the answer is:

draper

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

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

'behaving as though he were a doctor?' is the wordplay.
I cannot really see how this works, but
'a' could be 'per' and 'per' is found within the answer.
'doctor?' could be 'dr' ('Dr' can be a synonym of 'doctor') and 'dr' is located in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'who's' is the link.

Can you help me to learn more?

(Other definitions for draper that I've seen before include "Retailer of fabrics" , "Dealer in cloth and clothing" , "man of the cloth" , "Seller of textiles" , "One sells clothes" .)

I've seen this clue in the Evening Standard.
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