It involves a rubber as games have to be replayed (7)
I believe the answer is:
massage
'it involves a rubber' is the definition.
The definition suggests a singular noun which matches the answer.
'as games have to be replayed' is the wordplay.
'as games' can be anagrammed to 'MASSAGE'.
Though, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for massage that I've seen before include "See 10" , "Manipulate the muscles" , "Rubbing of muscles" , "Relaxing manipulation" , "Rub to relieve pain" .)