Spoiling plan for setting up exercise group (9)
I believe the answer is:
pampering
'spoiling' is the definition.
('pamper' can be a synonym of 'spoil')
'plan for setting up exercise group' is the wordplay.
'plan for' becomes 'map' (I can't explain this - if you can you should believe this answer much more).
'setting up' says the letters should be written backwards.
'exercise' becomes 'pe' (Physical Education).
'group' becomes 'ring' (a ring is a criminal organisation).
'map' in reverse letter order is 'pam'.
'pam'+'pe'+'ring'='PAMPERING'
Can you help me to learn more?
(Other definitions for pampering that I've seen before include "indulgence" , "Overindulging" .)