With charm at last, I melted the fellow (8)
I believe the answer is:
talisman
'with charm' is the definition.
'talisman' can be an answer for 'charm' (I've seen this before). I'm unsure of the 'with' bit.
'last i melted the fellow' is the wordplay.
'melted' indicates an anagram.
'the fellow' becomes 'man' (fellow can mean a man).
'last'+'i'='lasti'
'lasti' is an anagram of 'talis'.
'talis'+'man'='TALISMAN'
'at' is the link.
Can you help me to learn more?
(Other definitions for talisman that I've seen before include "Object thought to guard against evil" , "Protective charm" , "Good luck token" , "which is charming" , "Object supposed to guard against evil" .)