Abstain (7)
There are a few possibilities for this:
sit out
'abstain' is the definition.
(I know that abstain is a more specific form of refrain)
This is all the clue.
(Other definitions for refrain that I've seen before include "tune" , "Break off" , "Do without" , "Main part of song - do not do it" , "Cease - repeated phrase" .)
'abstain' is the definition.
(I know that abstain is a more specific form of forbear)
This is all the clue.
(Other definitions for forbear that I've seen before include "Refrain from doing something" , "Hold back" , "Abstain" , "Be patient" .)
'abstain' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sit out that I've seen before include "Avoid participation in (a dance etc)" , "Stop, check (progress)" .)