Went riding with Isaac in outer Brentford (5)
I believe the answer is:
biked
'went riding' is the definition.
The definition and answer can be both to do with motion as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?
'isaac in outer brentford' is the wordplay.
'isaac' becomes 'ike' (I can't justify this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'outer' suggests removing the centre.
'brentford' with its centre taken out is 'bd'.
'ike' inserted within 'bd' is 'BIKED'.
'with' is the link.
Can you help me to learn more?
(Another definition for biked that I've seen is " did swarm in the Highlands".)