Parking place for sport (4)
I believe the answer is:
play
'for sport' is the definition.
(synonyms)
'parking place' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'place' becomes 'lay' (synonyms).
'p'+'lay'='PLAY'
(Other definitions for play that I've seen before include "Amuse oneself - drama" , "Freedom of movement" , "Portray in a drama" , "Hamlet, for example" , "Uncle's premises" .)