Piece from Tahiti, a rare jewelled headdress (5)

I believe the answer is:

tiara

'jewelled headdress' is the definition.
(tiara is a kind of jewelled headdress)

'piece from tahiti a rare' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'TIARA' can be found hidden inside 'from tahiti a rare'.

(Other definitions for tiara that I've seen before include "Jewelled headband" , "Jewelled head ornament" , "Jewelled head band" , "Ornamental headpiece" , "Women's head ornament" .)

I've seen this clue in The Telegraph.

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