Old peaceful statesman with great leaders advocating nonviolence digging heels in (6)
I believe the answer is:
gandhi
'old peaceful statesman' is the definition.
'gandhi' can be an answer for 'statesman' (I've seen this before). I'm not certain of the 'old peaceful' bit.
'great leaders advocating nonviolence digging heels in' is the wordplay.
'great' becomes 'g' (this might be a standard abbreviation of which I'm unaware).
'leaders' says to take the initial letters.
The initial letters of 'advocating nonviolence digging heels in' is 'andhi'.
'g'+'andhi'='GANDHI'
'with' is the link.
Can you help me to learn more?
(Other definitions for gandhi that I've seen before include "hunger-striker" , "film epic" , "Old Indian leader" , "Indian political dynasty" , "Follower of one side in the Wars of the Roses" .)