Crossword Genius

Can one ever go straight? (5)

Ross

I believe the answer is:

crook

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This could be a double definition.

'can' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'one ever go straight?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

Can you help me to learn more?

(Other definitions for crook that I've seen before include "Criminal - taken in hand by bishop" , "Bend; criminal; staff" , "Fence, perhaps" , "Twister" , "Swindler - crosier - ill (in Australia)" .)

I've seen this clue in the Evening Standard.
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