Forward -- is one out? (7)
I believe the answer is:
I believe this clue is a double definition.
'forward' is the first definition.
(forward can mean a football striker)
'is one out?' is the second definition.
(I've seen this in another clue)
(Other definitions for striker that I've seen before include "Cricketer facing the bowlers" , "One not working" , "One refusing to work - rings the bell" , "One walking a picket-line" , "One expected to score in football" .)