Vanish onto back road with parking disc fee (9)
I believe the answer is:
evaporate
'vanish' is the definition.
(I've seen this in another clue)
'onto back road with parking disc fee' is the wordplay.
'onto' means one lot of letters go next to another.
'back road with' becomes 'eva' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'parking' becomes 'p' (abbreviation on road signs).
'disc' becomes 'O' (disc-shaped letter).
'fee' becomes 'rate' (I've seen this in other clues).
'eva' put next to 'p' is 'evap'.
'evap'+'o'+'rate'='EVAPORATE'
Can you help me to learn more?
(Other definitions for evaporate that I've seen before include "vanish" , "Vaporise" , "go a stage further?" , "Dissolve into the air" , "Turn from liquid to vapour" .)