Retired American chap exuding sweetness (6)
I believe the answer is:
sugary
'exuding sweetness' is the definition.
I can't judge whether this definition defines the answer.
'retired american chap' is the wordplay.
'retired' says the letters should be written backwards.
'american' becomes 'US' (abbreviation for United States).
'chap' becomes 'gary' ().
'us' backwards is 'su'.
'su'+'gary'='SUGARY'
Can you help me to learn more?
(Other definitions for sugary that I've seen before include "Sweet, syrupy" , "Excessively sweet or saccharine" , "Over-sentimental" , "Sweet, perhaps too much so" , "Excessively sentimental" .)