A supporter, this bird? (5)

I believe the answer is:

stilt

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'this bird?' is the definition.
(stilt is a kind of bird)

I don't understand the rest of the clue.

(Other definitions for stilt that I've seen before include "Wading bird; post" , "laboured and unnatural in the past" , "gets one member off the ground" , "Aid for walking tall" , "Long-legged bird" .)

I've seen this clue in the Evening Standard.

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