Office equipment, basic piece (6,3)
I believe the answer is:
staple gun
'office equipment' is the definition.
(staple gun is a type of stationary equipment)
'basic piece' is the wordplay.
'basic' becomes 'staple' (synonyms).
'piece' becomes 'gun' (slang term for a gun).
'staple'+'gun'='STAPLE GUN'
(Other definitions for staple gun that I've seen before include "Tool for inserting fasteners" , "One that fires those fixing" .)