Treatment for the feet can be fun (4)

I believe the answer is:
fete
'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 don't see?
'treatment for the feet' is the wordplay.
'treatment for' indicates anagramming the letters (I've seen this in other clues).
'feet' is an anagram of 'FETE'.
'can' acts as a link.
Can you help me to learn more?
(Other definitions for fete that I've seen before include "Celebrate; village fair" , "A festival of feet" , "Outdoor festival" , "Village festivity" , "Fund-raising function; festival" .)
