Parking on overly new floating walkway (7)
I believe the answer is:
pontoon
'floating walkway' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'parking on overly new' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'overly' becomes 'too' (to too great a degree).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'p'+'on'+'too'+'n'='PONTOON'
Can you help me to learn more?
(Other definitions for pontoon that I've seen before include "Floating bridge support" , "Card game; float" , "'Flat-bottomed boat, card game and Mayo town (7)'" , "Vingt-et-un" , "Blackjack" .)