Direction indicated by Robin Redbreast's tail (4)

I believe the answer is:

east

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'direction' is the definition.
(compass direction)

'indicated by robin redbreast's tail' is the wordplay.
'EAST' is hidden within the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for east that I've seen before include "To right if facing North" , "playing partner" , "Bearing of 90 degrees" , "Compass bearing" , "One regularly holding hands" .)

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