No tears, perhaps for betrayal (7)
I believe the answer is:
treason
'for betrayal' is the definition.
(synonyms)
'no tears perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'no'+'tears'='notears'
'notears' with letters rearranged gives 'TREASON'.
(Other definitions for treason that I've seen before include "Serious crime" , "Betrayal of one's nation" , "Lese-majesty" , "Senator (anag)" , "Stare on (anag.)" .)