Ram (3)
'ram' is the definition.
(both can mean a male sheep)
This is the entire clue.
(Other definitions for tup that I've seen before include "Sheepish male" , "Ram" , "sheep" .)
(Other definitions for bash that I've seen before include "Party; beat" , "Hit hard; party (slang)" , "Party; attempt (slang)" , "Heavy blow; party" , "Try - rave-up" .)