An animal Biggles could have used? (5)

I believe the answer is:

camel

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'an animal' is the definition.
(I know that Camel is a animal)

I don't understand the remainder of the clue.

(Other definitions for camel that I've seen before include "Humped creature" , "One travelling in caravan" , "Bearer of burdens" , "Pale brown - animal" , "Humped animal" .)

I've seen this clue in the Evening Standard.

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