Son kissed and lapsed morally? (7)
I believe the answer is:
slipped
'lapsed morally?' is the definition.
(slip can mean to sin or offend)
'son kissed' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'kissed' becomes 'lipped' (lip can mean to kiss).
's'+'lipped'='SLIPPED'
'and' acts as a link.
(Other definitions for slipped that I've seen before include "made a mistake" , "Made an error" , "Slid" .)