Sound of hooter I put in (5)
I believe the answer is:
noise
'sound' is the definition.
(noise is a kind of sound)
'hooter i put in' is the wordplay.
'hooter' becomes 'nose' (I've seen this before).
'put in' is an insertion indicator.
'nose' enclosing 'i' is 'NOISE'.
'of' acts as a link.
(Other definitions for noise that I've seen before include "Din, cacophony" , "Unwelcome sound" , "explosive report, for example" , "Static - sound" , "Loud or unpleasant sound" .)