Sign more leaders dismissed snub (6)
I believe the answer is:
ignore
'sign more leaders dismissed snub' is the definition.
I can't judge whether this defines the answer.
'dismissed snub' is the wordplay.
'dismissed' becomes 'ignored' ('ignore' can be a synonym of 'dismiss').
'snub' means to remove the last letter (I've seen 'snubbed' mean this (could historically mean cutting the end off)).
'ignored' with its final letter removed is 'IGNORE'.
Can you help me to learn more?
(Other definitions for ignore that I've seen before include "Slight" , "set aside" , "Blank" , "Pay no heed to" , "Region (anag)" .)