He walks leisurely along the street with a wave (8)
I believe the answer is:
stroller
'he walks' is the definition.
(I've seen this before)
'street with a wave' is the wordplay.
'street' becomes 'st' (abbreviation).
'with' says to put letters next to each other.
'a wave' becomes 'roller' (roller is a kind of wave).
'st'+'roller'='STROLLER'
'leisurely along the' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for stroller that I've seen before include "He walks" , "Walker" , "One wandering about" , "baby carriage" , "One going along leisurely" .)