I would return to a clan and harangue (8)
I believe the answer is:
diatribe
'harangue' is the definition.
(I've seen this before)
'i would return to a clan' is the wordplay.
'i would' becomes 'I'd'.
'return' is a reversal indicator.
'clan' becomes 'tribe' (synonyms).
'id' back-to-front is 'di'.
'di'+'a'+'tribe'='DIATRIBE'
'and' is the link.
(Other definitions for diatribe that I've seen before include "Bitter critical attack" , "Insults" , "Vitriolic speech" , "stream of abuse" , "'Abusive, bitter speech (8)'" .)