Irish tribe determined to seize power (4)
I believe the answer is:
sept
'irish tribe' is the definition.
'sept' can be an answer for 'tribe' (sept is a kind of tribe). I am unsure of the 'irish' bit.
'determined to seize power' is the wordplay.
'determined' becomes 'set' (similar in meaning).
'to seize' means one lot of letters goes inside another.
'power' becomes 'p' (symbol in physics).
'set' going around 'p' is 'SEPT'.
Can you help me to learn more?
(Other definitions for sept that I've seen before include "Part of clan" , "Short month" , "Irish family group" , "Thirty days" , "Division of a tribe in Ireland or Scotland" .)