Tramp and horse meet (4,4)
I believe the answer is:
bump into
'meet' is the definition.
(thesaurus)
'tramp and horse' is the wordplay.
'tramp' becomes 'bum' (both can mean a homeless person).
'and' is a charade indicator (letters next to each other).
'horse' becomes 'pinto' (pinto is a kind of horse).
'bum'+'pinto'='BUMP INTO'
(Other definitions for bump into that I've seen before include "Come across unexpectedly" , "Encounter" , "Chance upon" , "meet, unexpectedly" , "Unintentionally come across" .)