Perhaps bye-bye kiss stops tears flowing? (6)
I believe the answer is:
extras
'perhaps bye-bye' is the definition.
I can't tell whether this defines the answer.
'kiss stops tears flowing?' is the wordplay.
'kiss' becomes 'x'.
'stops' is an insertion indicator.
'flowing?' is an anagram indicator.
'tears' anagrammed gives 'etras'.
'x' going within 'etras' is 'EXTRAS'.
Can you help me to learn more?
(Other definitions for extras that I've seen before include "Bit players in film" , "Bit players, actors without dialogue" , "Wides, byes, etc." , "Bit actors in film" , "They're additional on a film set" .)