Tease short bloke very loudly (5)
I believe the answer is:
chaff
'tease' is the definition.
(chaffing is a kind of teasing)
'short bloke very loudly' is the wordplay.
'short' means to remove the last letter.
'bloke' becomes 'chap' (I've seen this before).
'very loudly' becomes 'ff'.
'chap' with its last letter taken away is 'cha'.
'cha'+'ff'='CHAFF'
(Other definitions for chaff that I've seen before include "Separated grain husks" , "Light banter - husks from corn" , "Corn husks - worthless stuff" , "Worthless material (from corn)" , "Shucks" .)