Lack of guile and love found in a dog (7)
I believe the answer is:
candour
'lack of guile' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'and love found in a dog' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'found in' is an insertion indicator.
'a dog' becomes 'cur' (both can mean a despicable person).
'and'+'o'='ando'
'ando' put within 'cur' is 'CANDOUR'.
Can you help me to learn more?
(Other definitions for candour that I've seen before include "open)" , "Frankness, openness" , "'Frankness, honesty (7)'" , "Forthrightness" , "sincerity" .)