College servant in alien land (5)
I believe the answer is:
egypt
'land' is the definition.
(I know that Egypt is a empire)
'college servant in alien' is the wordplay.
'college servant' becomes 'gyp' (I've seen this before).
'in' indicates putting letters inside.
'alien' becomes 'et' (extra terrestrial).
'gyp' inserted inside 'et' is 'EGYPT'.
(Other definitions for egypt that I've seen before include "Site of Sinai desert" , "International team" , "NE African republic" , "Home of the Sphinx" , "Northeast African country" .)