Shed tears when parking in the rain (4)
I believe the answer is:
wept
'shed tears' is the definition.
(I've seen this before)
'parking in the rain' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'in the' is an insertion indicator.
'rain' becomes 'wet' (I've seen this in other clues).
'p' placed inside 'wet' is 'WEPT'.
'when' is the link.
(Other definitions for wept that I've seen before include "Shed tears of grief" , "lamented" , ""Jesus __" (shortest verse in the King James Bible)" , "Cried, sobbed" , "Was unhappy" .)