Crown sticks rebellious clan in wood (8)
I believe the answer is:
pinnacle
'crown sticks' is the definition.
'pinnacle' can be an answer for 'crown' (I've seen this before). I'm not sure about the 'sticks' bit.
'rebellious clan in wood' is the wordplay.
'rebellious' is an anagram indicator.
'in' is an insertion indicator.
'wood' becomes 'pine' (pine is a kind of wood).
'clan' is an anagram of 'nacl'.
'nacl' put inside 'pine' is 'PINNACLE'.
Can you help me to learn more?
(Other definitions for pinnacle that I've seen before include "High pointed piece of rock" , "Apex" , "The highest point, say of fame" , "Culmination" , "Apogee" .)