Daughter meeting dissolute fellow — a flighty male (5)
I believe the answer is:
drake
'a flighty male' is the definition.
'daughter meeting dissolute fellow' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'meeting' says to put letters next to each other.
'dissolute fellow' becomes 'rake' (historical term for an immoral man).
'd'+'rake'='DRAKE'
(Other definitions for drake that I've seen before include "English circumnavigator, d. 1596" , "First English captain to sail round the world" , "it's used to fish" , "Explorer" , "world traveller" .)