Concerned with short Welsh dog going around shopkeeper (6)
I believe the answer is:
grocer
'shopkeeper' is the definition.
(I've seen this before)
'concerned with short welsh dog going around' is the wordplay.
'concerned with' becomes 're'.
'short' means to remove the last letter.
'welsh dog' becomes 'corgi' (I've seen this before).
'going around' shows that the letters should be reversed in order.
'corgi' with its last letter taken away is 'corg'.
're'+'corg'='recorg'
'recorg' reversed gives 'GROCER'.
(Other definitions for grocer that I've seen before include "Retailer of food and small household goods" , "Seller of food and household supplies" , "Provisions purveyor" , "Chesterton's wicked tradesman" , "Seller of household items and food" .)