Speech extolling a group we’ve left? (6)
I believe the answer is:
eulogy
'speech' is the definition.
(I have seen 'Speech of praise ' mean 'eulogy' so perhaps 'speech' could also mean 'eulogy')
I cannot understand how the rest of the clue works.
(Other definitions for eulogy that I've seen before include "'Encomium, paean (6)'" , "Funeral speech" , "Speech or piece of writing that praises highly" , "Expression of high praise" , "Funeral oration" .)