Reportedly make fun of banker (4)
I believe the answer is:
tees
'banker' is the definition.
(I've seen this before)
'reportedly make fun of' is the wordplay.
'reportedly' shows a homophone (sound like).
'make fun of' becomes 'tease' (to make fun of someone is to tease them).
'tease' is a homophone of 'TEES'.
(Other definitions for tees that I've seen before include "sand-hills" , "Golfer's supports; river" , "Stockton's river" , "River of north-east England" , "Starting places on the golf course" .)