Parking deal changed: use stationary bike (5)
I believe the answer is:
pedal
'bike' is the definition.
(I know that bike can be written as pedal)
'parking deal changed' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'changed' is an anagram indicator.
'deal' with letters rearranged gives 'edal'.
'p'+'edal'='PEDAL'
'use stationary' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pedal that I've seen before include "One of two a cyclist needs" , "Brake or clutch perhaps" , "ride a cycle" , "Power a bike" , "Foot control" .)