Crossword Genius

The seat of rule, where birds are concerned? (5)

Ross

I believe the answer is:

roost

I'm a little stuck... Click here to teach me more about this clue!

'the seat' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'of rule where birds are concerned?' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is located in the answer.
'rule' could be 'r' (legal abbreviation) and 'r' is present in the answer.
The remaining letters 'ost' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for roost that I've seen before include "Torso (anag)" , "The cock rules it" , "Thin paper" , "Temporary place to stay" , "Henhouse" .)

I've seen this clue in the Evening Standard.
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