Father meets northern temptress (5)
I believe the answer is:
siren
'temptress' is the definition.
(I know that temptress can be written as siren)
'father meets northern' is the wordplay.
'father' becomes 'sire' (synonyms).
'meets' means one lot of letters go next to another.
'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" .)