Show northern chap should host for singer (4,7)

'should host for singer' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'show northern chap' is the wordplay.
I cannot really see how this works, but
'show' could be 'evince' (synonyms) and 'evince' is located in the answer.
'northern' could be 'n' (abbreviation e.g. N. Ireland) and 'n' is present in the answer.
'chap' could be 'gent' (I've seen this in other clues) and 'gent' is found within the leftover letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?