A flier ("Big Bill") to help you across the road (7)

I believe the answer is:

pelican

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'a flier' is the definition.
(pelican is a kind of birdanimal)

I don't understand the remainder of the clue.

(Other definitions for pelican that I've seen before include "Long-billed aquatic bird" , "The large bird is in place" , "Nice pal (anag)" , "Large water bird" , "Long-billed waterbird" .)

I've seen this clue in the Evening Standard.

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