Upper-class gent goes to see about sweets (7)
I believe the answer is:
toffees
'sweets' is the definition.
(toffee is a kind of sweet)
'upper-class gent goes to see about' is the wordplay.
'upper-class gent' becomes 'toff' (I've seen this in other clues. I am not sure about the 'upper-class' bit.).
'goes to' means one lot of letters go next to another.
'about' is an anagram indicator.
'see' is an anagram of 'ees'.
'toff'+'ees'='TOFFEES'
Can you help me to learn more?
(Other definitions for toffees that I've seen before include "Caramels" , "Sweets" .)