Having had one’s fill at tea, is lively (7)
I believe the answer is:
'having had one's fill' is the definition.
I can't judge whether this defines the answer.
'at tea is lively' is the wordplay.
'lively' is an anagram indicator (letters get livened up or moved around).
'atteais' is an anagram of 'SATIATE'.
Can you help me to learn more?
(Other definitions for satiate that I've seen before include "content" , "stuff" , "Have more than enough" , "Fill to satisfaction" , "Satisfy fully, cloy with excess" .)