Fielders upset over splitting prize money? (6)
I believe the answer is:
spoils
'prize money?' is the definition.
'spoils' can be an answer for 'prize' (thesaurus). I'm not sure about the 'money?' bit.
'fielders upset over splitting' is the wordplay.
'fielders' becomes 'slips' (cricket term).
'upset' says the letters should be written in reverse.
'over' becomes 'o' (cricket abbreviation).
'splitting' is an insertion indicator (some letters split a word into two).
'slips' backwards is 'spils'.
'spils' going around 'o' is 'SPOILS'.
Can you help me to learn more?
(Other definitions for spoils that I've seen before include "Booty" , "Pampers with plunder?" , "Damages" , "Ill-gotten gains" , "Mars the loot" .)