Track down missing note in cabin (3)
I believe the answer is:
hut
'cabin' is the definition.
(I've seen this in another clue)
'track down missing note' is the wordplay.
'track down' becomes 'hunt' (synonyms).
'missing' indicates named letters should be taken away.
'note' becomes 'n' (abbreviation).
'hunt' with 'n' removed is 'HUT'.
'in' acts as a link.
(Other definitions for hut that I've seen before include "Small roughly-made house or shelter" , "Simple house or shelter" , "Small building or shelter" , "Small wooden shelter" , "Small crude dwelling" .)