Those who would put a great player out of work? (6)
I believe the answer is:
people
'those who would put a great' is the definition.
The definition suggests an adverb but the answer is not.
'player out of work?' is the wordplay.
'player' becomes 'Pele' (Brazilian footballer Pele).
'out of' is an insertion indicator (some letters on the outside of others).
'work?' becomes 'op' (common abbreviation for 'opus').
'pele' enclosing 'op' is 'PEOPLE'.
Can you help me to learn more?
(Other definitions for people that I've seen before include "Men, women and children" , "Mortals" , "country folk" , "Population" , "Humankind" .)