Contract, perhaps, that engineers might find lucrative (6)

I believe the answer is:

bridge

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'contract perhaps' is the definition.
(I know that contract bridge is a type of bridge)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for bridge that I've seen before include "going across river?" , "Game of cards" , "Join" , "Where four hands are needed" , "Four-handed card game" .)

I've seen this clue in the Evening Standard.

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