Some concern as alarm sounded by hooter (5)
I believe the answer is:
nasal
'hooter' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'some concern as alarm sounded' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'NASAL' can be found hidden inside 'concern as alarm sounded'.
'by' is the link.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "pinched" , "Of sound, as if it came through the nose" , "Relating to the nose" , "Like some spray" , "Beak's" .)