Artist capturing energy in fellow - it’s nutty but sweet (8)
I believe the answer is:
marzipan
'sweet' is the definition.
(marzipan is a kind of sweet)
'artist capturing energy in fellow it's nutty' is the wordplay.
I cannot really see how this works, but
'energy' could be 'zip' (I've seen this before) and 'zip' is located in the answer.
'artist' could be 'ra' (Royal Academician, member of Royal Academy of Arts) and 'ra' is located in the remaining letters.
'fellow' could be 'man' (fellow can mean a man) and 'man' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
'but' acts as a link.
Can you help me to learn more?
(Other definitions for marzipan that I've seen before include "coat often iced over?" , "almond concoction" , "Paste on cake" , "Marchpane" , "Sweet paste of ground almonds" .)