Burger prepared with toppings of Danish bacon, egg mayo, Iberico ham and a spanner (6,6)

I believe the answer is:

humber bridge

'spanner' is the definition.
(a bridge is something spanning two points)

I cannot understand how the remainder of the clue works.

(Other definitions for humber bridge that I've seen before include "Link between Hull and the South" , "UK landmark" .)

I've seen this clue in The Guardian.

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