Oh! Little bit of porridge stuck in beard (6)
I believe the answer is:
goatee
'beard' is the definition.
(goatee is a kind of beard)
'oh little bit of porridge stuck' is the wordplay.
I cannot quite see how this works, but
'oh' could be 'o' and 'o' is found within the answer.
'bit' could be 'ate' ('bite' can be similar in meaning to 'eat') and 'ate' is found within the answer.
The remaining letters 'ge' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for goatee that I've seen before include "It's hairy" , "Kind of beard" , "Style of beard" , "Small pointy beard" , "Type of beard" .)