One-time back massage received by game committee (9)
I believe the answer is:
politburo
'committee' is the definition.
(I know that politburo is a type of committee)
'one-time back massage received by game' is the wordplay.
'one time' becomes 't' (abbreviation).
'back' says the letters should be written backwards.
'massage' becomes 'rub' (I've seen this before).
'received' means one lot of letters goes inside another.
'by game' becomes 'polio' (I can't justify this - if you can you should believe this answer much more).
'rub' in reverse letter order is 'bur'.
't'+'bur'='tbur'
'tbur' inserted inside 'polio' is 'POLITBURO'.
Can you help me to learn more?
(Other definitions for politburo that I've seen before include "party executive" , "Soviet leaders" , "Former USSR rulers" , "Ruling Soviet committee" , "Top Communist Party political committee" .)