Sat and finished supper with a bit of cheddar (7)
I believe the answer is:
perched
'sat' is the definition.
(perching is a kind of sitting)
'finished supper with a bit of cheddar' is the wordplay.
'finished supper' becomes 'hed' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'bit of' suggests taking the first letters.
The initial letter of 'cheddar' is 'c'.
'per'+'c'='perc'
'hed' after 'perc' is 'PERCHED'.
'and' acts as a link.
Can you help me to learn more?
(Another definition for perched that I've seen is " Sat on a branch".)