Fielder I'm about to remove (3-3)
I believe the answer is:
mid-off
'fielder' is the definition.
(I've seen this before)
'i'm about to remove' is the wordplay.
'about' shows that the letters should be reversed in order.
'to' is a charade indicator (letters next to each other).
'remove' becomes 'doff' (I've seen this before).
'im' in reverse letter order is 'mi'.
'mi'+'doff'='MID-OFF'
(Other definitions for mid-off that I've seen before include "Cricket fielding position" , "Position in the field" , "Someone in field" .)