Picking up nose on wine after you and taster ultimately agreed (9)
I believe the answer is:
concurred
'agreed' is the definition.
('concur' can be a synonym of 'agree')
'picking up nose on wine after you and taster ultimately' is the wordplay.
I cannot quite understand how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found within the answer.
'you' could be 'u' (commonly used in online communication) and 'u' is found in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
This explanation may well be incorrect...
(Other definitions for concurred that I've seen before include "Acquiesced" , "Agreed" .)