Father meets northern temptress (5)
I believe the answer is:
siren
'temptress' is the definition.
(synonyms)
'father meets northern' is the wordplay.
'father' becomes 'sire' (synonyms).
'meets' says to put letters next to each other.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'sire'+'n'='SIREN'
(Other definitions for siren that I've seen before include "Alarm - fascinating woman" , "Warning sound" , "Hooter - dangerous woman?" , "Temptress - makes a loud noise!" , "Loud whistle for sea temptress" .)