Rodent in yellow vessel hidden in wood (9)
I believe the answer is:
porcupine
'rodent' is the definition.
(porcupine is a kind of rodent)
'yellow vessel hidden in wood' is the wordplay.
I cannot really see how this works, but
'yellow' could be 'or' (heraldic term) and 'or' is present in the answer.
'vessel' could be 'cup' (I've seen this in other clues) and 'cup' is present in the answer.
'wood' could be 'pine' (pine is a kind of wood) and 'pine' is found in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for porcupine that I've seen before include "prickly type" , "Large spiny rodent" , "Spiny creature" , "Rodent with sharp black-and-white spikes" , "Rodent with sharp bristles" .)