Seaside walk with Penny delayed walk in the park (4)
I believe the answer is:
romp
'walk in the park' is the definition.
(I've seen this in another clue)
'seaside walk with penny delayed' is the wordplay.
I cannot quite see how this works, but
'penny' could be 'p' (short for pence) and 'p' is located in the answer.
The remaining letters 'rom' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for romp that I've seen before include "Play boisterously" , "Proceed energetically" , "Lively play during prom" , "High jinks" , "Play in a lively way, like children" .)