Crossword Genius

Chain to a London bridge (6)

Ross

I believe the answer is:

albert

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'chain' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for albert that I've seen before include "watch may depend on it" , "Old watch chain" , "chap" , "Victim of lion" , "and 7: French missionary" .)

I've seen this clue in The Daily Express.
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