Morally weak perhaps giving Father trouble (5)
I believe the answer is:
frail
'morally weak' is the definition.
(I've seen this in another clue)
'giving father trouble' is the wordplay.
'giving' means one lot of letters go next to another.
'father' becomes 'fr' (abbreviation as in a priest's title).
'trouble' becomes 'ail' (synonyms).
'fr'+'ail' is 'FRAIL'.
'perhaps' is the link.
(Other definitions for frail that I've seen before include "Easily shattered" , "old and weak" , "Feeble - basket" , "Decrepit" , "Easily destroyed" .)