Alternate reel (7)
I believe the answer is:
stagger
This clue is a double definition.
'alternate' is the first definition.
(thesaurus)
'reel' is the second definition.
('stagger' can be a synonym of 'reel')
(Other definitions for stagger that I've seen before include "Walk unsteadily, from weakness or drink" , "bowl over" , "Walk as if about to fall" , "Teeter" , "move by someone under the table?" .)