Fido shows there's nothing in chewing a chop (5)
I believe the answer is:
pooch
'fido' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?
'there's nothing in chewing a chop' is the wordplay.
'there's nothing' becomes 'o' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'chewing' is an anagram indicator.
'chop' with letters rearranged gives 'poch'.
'o' inserted within 'poch' is 'POOCH'.
'shows' acts as a link.
Can you help me to learn more?
(Other definitions for pooch that I've seen before include "Doggy" , "one of our best friends" , "Dog (colloq.)" .)