Metal tool for adjusting nuts and bolts (7)

I believe the answer is:

spanner

(Other definitions for spanner that I've seen before include "Nut tightener" , "In the works, this tool is an obstacle" , "Common tool" , "Tool for gripping nut" , "In the works, this tool is a headache" .)

I've seen this clue in the Sydney Morning Herald.

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