Novelist and son not quite right (5)
I believe the answer is:
amiss
'not quite right' is the definition.
(I've seen this in another clue)
'novelist and son' is the wordplay.
'novelist' becomes 'amis' (Kingsley or Martin Amis).
'and' is a charade indicator (letters next to each other).
'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" .)