Colonial rule making shock comeback (3)
I believe the answer is:
raj
'colonial rule' is the definition.
'raj' can be an answer for 'rule' (raj is a kind of rule). I'm not certain of the 'colonial' bit.
'shock comeback' is the wordplay.
'shock' becomes 'jar' (I've seen this before).
'comeback' shows that the letters should be reversed in order.
'jar' backwards is 'RAJ'.
'making' acts as a link.
Can you help me to learn more?
(Other definitions for raj that I've seen before include "British rule (in 19dn)" , "Jar (anag.)" , "Indian rule in India" , "British dominion over India" , "Jar this rule in India" .)