Avoid having go turning military leader (6)
I believe the answer is:
shogun
'military leader' is the definition.
'shogun' can be an answer for 'leader'. I am not certain of the 'military' bit.
'avoid having go turning' is the wordplay.
'avoid' becomes 'shun' (shunning is a kind of avoiding).
'having' means one lot of letters goes inside another.
'turning' says the letters should be written in reverse.
'go' in reverse letter order is 'og'.
'shun' going around 'og' is 'SHOGUN'.
Can you help me to learn more?
(Other definitions for shogun that I've seen before include "Foreign C-in-C" , "Japanese military dictator" , "Japanese head" , "Feudal Japanese leader" , "military commander" .)