Fix rotating handle - starter for double-decker (5)

I believe the answer is:

amend

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'fix' is the definition.
(I know that fix is a more specific form of the action amend)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for amend that I've seen before include "Make small changes to" , "Modify - edit" , "Rectify" , "Make minor changes to" , "Alter in detail" .)

I've seen this clue in The Independent.

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