Seductive singer stripping off northern father (4)
I believe the answer is:
sire
'father' is the definition.
(I know that father can be written as sire)
'seductive singer stripping off northern' is the wordplay.
'seductive singer' becomes 'sir' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'stripping off' means to look at the middle letters (the word is stripped of its exterior letters).
'northern' becomes 'Federal' (similar in meaning).
The central letter of 'federal' is 'e'.
'sir'+'e'='SIRE'
Can you help me to learn more?
(Other definitions for sire that I've seen before include "Bear" , "Male parent of an animal" , "Male parent of a horse, for example" , "Old form of address to king - rise to it" , "Male parent of, say, horse" .)