Crossword Genius

Turned out to consume tea that's unfamiliar (9)

Ross

I believe the answer is:

uncharted

'unfamiliar' is the definition.
(thesaurus)

'turned out to consume tea' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'to consume' is an insertion indicator.
'tea' becomes 'cha' (cha is a type of tea).
'turned' anagrammed gives 'unrted'.
'unrted' enclosing 'cha' is 'UNCHARTED'.

'that's' acts as a link.

(Other definitions for uncharted that I've seen before include "Of regions not yet surveyed" , "Not mapped for navigation" .)

I've seen this clue in The Telegraph.
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