Spoken of tea plant one tries (6)
I believe the answer is:
taster
'one tries' is the definition.
(someone trying or tasting something)
'spoken of tea plant' is the wordplay.
'spoken of' shows a homophone (sound like).
'plant' becomes 'aster' (aster is a kind of plant).
'tea' sounds like 't'.
't'+'aster'='TASTER'
(Other definitions for taster that I've seen before include "Brief sample" , "Winery worker" , "One samples" , "Sample intended to stimulate interest" , "Art set (anag.)" .)