Just a little portion of cheese to get your teeth into (4)
I believe the answer is:
bite
'get your teeth into' is the definition.
'just a little portion of cheese' is the wordplay.
I cannot really understand how this works, but
'little' could be 'bit' (a little is a bit) and 'bit' is found within the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for bite that I've seen before include "Morsel" , "Take effect; snack" , "(Of fish) take the bait" , "Nip; nibble" , "Take bait; sting" .)