Walk recollected in Arden poem (9)
I believe the answer is:
promenade
'walk' is the definition.
(I know that promenade is a type of walk)
'recollected in arden poem' is the wordplay.
'recollected in' indicates an anagram (letters arranged or collected in a different way).
'arden'+'poem'='ardenpoem'
'ardenpoem' anagrammed gives 'PROMENADE'.
(Other definitions for promenade that I've seen before include "Seafront walkway" , "Esplanade" , "Seafront walk" , "Place for strolling by the sea" , "Seaside walkway" .)