Estimate — shot (5)
I believe the answer is:
guess
I believe this is a double definition.
'estimate' is the first definition.
(I know that estimate can be written as guess)
'shot' is the second definition.
(I know that shot can be written as guess)
(Other definitions for guess that I've seen before include "Hypothesis" , "Fancy" , "Estimate on the basis of little information" , "Divine - estimate" , "Conjecture - estimate" .)