Rest pool stick pocketing not in order (8)
I believe the answer is:
continue
'rest' is the definition.
('continue' can be a synonym of 'rest')
'pool stick pocketing not in order' is the wordplay.
'pool stick' becomes 'cue' ('cue' can be a synonym of 'pool stick').
'pocketing' means one lot of letters goes inside another.
'order' indicates anagramming the letters.
'not'+'in'='notin'
'notin' anagrammed gives 'ontin'.
'cue' going around 'ontin' is 'CONTINUE'.
(Other definitions for continue that I've seen before include "Go on without stopping" , "Carry on" , "Don't stop, keep going" , "Proceed" , "Persist" .)