Not unwilling to try a new blend of tea (7)
I believe the answer is:
testate
'new blend of tea' is the definition.
I can't judge whether this defines the answer.
'not unwilling to try a' is the wordplay.
'not unwilling' becomes 'te' (I can't justify this - if you can you should give a lot more credence to this answer).
'to' says to put letters next to each other (I've seen this in other clues).
'try' becomes 'test' (test is a kind of try).
'test'+'a'='testa'
'te' after 'testa' is 'TESTATE'.
Can you help me to learn more?
(Other definitions for testate that I've seen before include "Having made a last will and testament" , "Having made a valid will" , "Person willing" , "Dying with a will" , "Leaving a will" .)