A rascal, but I've left something to eat for him (5)

I believe the answer is:
scamp
'a rascal' is the definition.
(synonyms)
'i've left something to eat for him' is the wordplay.
I cannot quite see how this works, but
'him' could be 'cam' and 'cam' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'but' acts as a link.
Can you help me to learn more?
(Other definitions for scamp that I've seen before include "Scoundrel" , "Impish child" , "Rogue - perform inadequately" , "Scallywag" , "Mischief-maker" .)
