A stab or a shot? (5)
I believe the answer is:
guess
I believe this clue is a double definition.
'a stab' is the first definition.
(I have seen 'A stab' mean 'guess' so perhaps 'stab' could also mean 'guess')
'a shot?' is the second definition.
('guess' can be a synonym of 'shot')
'or' is the link.
(Other definitions for guess that I've seen before include "Speculation" , "Estimate; suppose" , "Estimate on the basis of little information" , "Imagine" , "the Americans believe it" .)