Pleasant frame of mind, brewing tea (9)
I believe the answer is:
temperate
'pleasant' is the definition.
(I've seen this before)
'frame of mind brewing tea' is the wordplay.
'frame of mind' becomes 'temper' (I've seen this in another clue).
'brewing' is an anagram indicator.
'tea' is an anagram of 'ate'.
'temper'+'ate'='TEMPERATE'
(Other definitions for temperate that I've seen before include "It is reasonable" , "Calm" , "Showing moderation" , "Controlled" , "sober" .)