Tease very loudly after tea (5)
I believe the answer is:
chaff
'tease' is the definition.
(chaff can mean to tease or mock)
'very loudly after tea' is the wordplay.
'very loudly' becomes 'ff' (short for fortissimo, 'very loud' in music).
'after' means one lot of letters go next to another.
'tea' becomes 'cha' (cha is a type of tea).
'ff' put after 'cha' is 'CHAFF'.
(Other definitions for chaff that I've seen before include "Corn-husks separated from the grain" , "Husks - jokes" , "It's separated from wheat during threshing" , "Worthless material (from corn)" , "something worth little" .)