Clamour when I pry about (5)
I believe the answer is:
noise
'clamour' is the definition.
(I've seen this before)
'i pry about' is the wordplay.
'pry' becomes 'nose' ('nose' can be a synonym of 'pry').
'about' means one lot of letters goes inside another.
'i' placed within 'nose' is 'NOISE'.
'when' is the link.
(Other definitions for noise that I've seen before include "Uproar" , "Unwanted sound" , "Clamour" , "Unstructured sound" , "Sound of any kind" .)