Shops conveniently situated by one: small row (11)
I believe the answer is:
patisseries
'shops' is the definition.
(I've seen this before)
'conveniently situated by one small row' is the wordplay.
'conveniently' becomes 'pat' (I've seen this in other clues).
'situated by one small' becomes 'is' (I am not sure about this - if you are sure you should believe this answer much more).
'row' becomes 'series' (both can mean a sequence of things).
'pat'+'is'+'series'='PATISSERIES'
Can you help me to learn more?
(Another definition for patisseries that I've seen is " shops".)