Diner once leaving a Devonian location? (6)
I believe the answer is:
exeter
'a devonian location?' is the definition.
The definition suggests a singular noun which matches the answer.
'diner once' is the wordplay.
I cannot quite see how this works, but
'once' could be 'ex' (prefix meaning former or onetime) and 'ex' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'leaving' acts as a link.
Can you help me to learn more?
(Other definitions for exeter that I've seen before include "English cathedral city" , "South-west English city" , "See" , "English university city" , "County town and cathedral city of Devon" .)