Delhis defensive arrangement (6)
I believe the answer is:
shield
'defensive arrangement' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'delhis' is the wordplay.
'delhis' can be anagrammed to 'SHIELD'.
Though, I am not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for shield that I've seen before include "Protective structure or device" , "Protect, screen" , "Is held as protective device" , "Protect (from danger)" , "Sporting trophy; protect" .)