Runner between banks at Stratford (4)
I believe the answer is:
avon
'runner' is the definition.
(I've seen this before)
'banks at stratford' is the wordplay.
I cannot really see how this works, but
'at' could be 'on' (location) and 'on' is found within the answer.
This explanation may well be incorrect...
'between' is the link.
Can you help me to learn more?
(Other definitions for avon that I've seen before include "Bath's river" , "English river flowing through Stratford" , "River and former county" , "English river name in multiple use" , "Name of three English rivers" .)