Plain in tribal discussions (4)

I believe the answer is:

bald

'plain' is the definition.
(both can mean unadorned)

'in tribal discussions' is the wordplay.
'in' says the answer is hidden in the clue.
'BALD' is hidden within 'tribal discussions'.

(Other definitions for bald that I've seen before include "Without hair" , "Follicly challenged?" , "Exposed" , "Lacking hair on the scalp" , "With the tread worn away" .)

I've seen this clue in The Sun.

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