Sobbed quietly, kept in by rain (4)
I believe the answer is:
'sobbed' is the definition.
(I've seen this before)
'quietly kept in by rain' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'kept in by' indicates putting letters inside.
'rain' becomes 'wet' (I've seen this in other clues).
'p' going inside 'wet' is 'WEPT'.
(Other definitions for wept that I've seen before include "Exclude, prohibit" , "Was unhappy" , ""Jesus __" (shortest verse in the King James Bible)" , "Cried, sobbed" , ""Jesus ___" (St John's Gospel, xi. 35)" .)