The food you have in your mouth (6)
I believe the answer is:
tongue
'mouth' is the definition.
(thesaurus)
'the food you have in your' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'food' could be 'e' (E is an example) and 'e' is located in the answer.
'you' could be 'u' (I've seen this in other clues) and 'u' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tongue that I've seen before include "One gut in the mouth" , "Style of speaking; lick" , "dialect" , "rudely, one could be put out" , "spit" .)