One maybe coming across interference in works? (7)
I believe the answer is:
spanner
I believe this is a double definition.
'one maybe coming across' is the first definition.
(something spanning two points)
'interference in works?' is the second definition.
(a spanner in the works)
(Other definitions for spanner that I've seen before include "Nut-turning tool" , "Hand tool to hold or twist" , "Common tool" , "Wrench for nuts" , "Tool for fastening nuts" .)