Refusal to include land (1,1,1)
'land' is the definition.
'refusal to include' is the wordplay.
'to include' indicates the answer is hidden within the clue.
'U S A' can be found hidden inside 'refusal'.
'land' is the definition.
(I know that U.S.A. is a great power)
'refusal to include' is the wordplay.
'to include' says the answer is hidden in the clue.
'USA' can be found hidden inside 'refusal'.
(Other definitions for usa that I've seen before include "A great national federation" , "United States" , "Trumpland?" , "Union" , "Land of the Free and the Home of the Brave" .)