Work with old craftsman, brewing tea (9)
I believe the answer is:
cooperate
'work' is the definition.
(cooperating is a kind of working)
'with old craftsman brewing tea' is the wordplay.
'with' means one lot of letters goes inside another.
'old craftsman' becomes 'cooper' (cooper is a kind of craftsman. I am not sure about the 'old' bit.).
'brewing' is an anagram indicator.
'tea' with letters rearranged gives 'ate'.
'cooper' inserted inside 'ate' is 'COOPERATE'.
Can you help me to learn more?
(Other definitions for cooperate that I've seen before include "fit in with others" , "Help" , "band together" , "Work together on a common enterprise" , "Play ball with" .)