In a wild feast, one can be fun (6)
I believe the answer is:
fiesta
'be fun' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'in a wild feast one' is the wordplay.
'in' means one lot of letters goes inside another.
'a wild' is an anagram indicator.
'one' becomes 'i' (Roman numeral).
'feast' with letters rearranged gives 'festa'.
'festa' going around 'i' is 'FIESTA'.
'can' acts as a link.
Can you help me to learn more?
(Other definitions for fiesta that I've seen before include "public event abroad" , "Saint's day; carnival" , "religious celebration" , "Public whoopee in Spain" , "Continental knees-up" .)