Novelist and son not quite right (5)
I believe the answer is:
amiss
'not quite right' is the definition.
(I've seen this before)
'novelist and son' is the wordplay.
'novelist' becomes 'amis' (Kingsley or Martin Amis).
'and' means one lot of letters go next to another.
'son' becomes 's' (genealogical abbreviation for son).
'amis'+'s'='AMISS'
(Other definitions for amiss that I've seen before include "inappropriately" , "Not quite right" , "(Gone) wrong" , "error" , "Faulty" .)