List has no heading for 'wading bird' (4)

I believe the answer is:

tilt

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'list' is the definition.
(list can mean to tilt or lean)

I can't explain the remainder of the clue.

(Other definitions for tilt that I've seen before include "Incline, lean" , "Slope, slant" , "Incline, slant" , "Slant - joust" , "Slope; use a lance in jousting" .)

I've seen this clue in The Guardian.

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