Beak to imprison one creating clamour (5)
I believe the answer is:
noise
'clamour' is the definition.
(I've seen this before)
'beak to imprison one' is the wordplay.
'beak' becomes 'nose' (I've seen this before).
'to imprison' means one lot of letters goes inside another.
'one' becomes 'i' (roman numeral).
'nose' enclosing 'i' is 'NOISE'.
'creating' acts as a link.
(Other definitions for noise that I've seen before include "Clatter" , "Clamour" , "Sound, disagreeable perhaps" , "Virgil's birthplace" , "Rumour" .)