Plan to shoot about half the guns (6)
I believe the answer is:
figure
'plan' is the definition.
(thesaurus)
'shoot about half the guns' is the wordplay.
'shoot' becomes 'fire' (as in firing a gun).
'about' indicates putting letters inside.
'half the' indicates taking half.
'guns' with half the letters taken is 'gu'.
'fire' enclosing 'gu' is 'FIGURE'.
'to' acts as a link.
(Other definitions for figure that I've seen before include "Reckon" , "The written symbol of a number" , "Diagram or digit" , "Build" , "Judge to be probable, estimate" .)