During burlesque, a Kerryman emits high-pitched noise (6)
I believe the answer is:
squeak
'high-pitched noise' is the definition.
(I've seen this before)
'during burlesque a kerryman emits' is the wordplay.
'during' indicates the answer is hidden within the clue.
'SQUEAK' is hidden within 'burlesque a kerryman emits'.
(Other definitions for squeak that I've seen before include "that's often narrow" , "Short, high-pitched sound" , "Bubble and --" , "Short high-pitched cry as of bat" , "Pip's partner -- quakes (anag)" .)