In Cowes, plan a delightful walk (9)
I believe the answer is:
esplanade
'walk' is the definition.
(esplanade is a kind of walk)
'in cowes plan a delightful' is the wordplay.
'in' indicates a hidden word.
'ESPLANADE' can be found hidden inside 'cowes plan a delightful'.
(Other definitions for esplanade that I've seen before include "Long wide pavement next to a beach" , "A leap ends (anag) - seaside feature" , "front" , "Seafront walkway" , "Level seashore walkway" .)