Crossword Genius

Form a union with James? (4)

Ross

I believe the answer is:

bond

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'james?' is the definition.
(James Bond is a fictional spy)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for bond that I've seen before include "Certificate of debt" , "Affinity" , "Tie - debenture" , "one licensed to kill" , "Written promise" .)

I've seen this clue in the Evening Standard.
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