Alibi revised to cover Queen and Country (7)
I believe the answer is:
liberia
'country' is the definition.
(I know that Liberia is a country)
'alibi revised to cover queen' is the wordplay.
'revised' indicates an anagram.
'to cover' indicates putting letters inside.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'alibi' anagrammed gives 'libia'.
'libia' going around 'er' is 'LIBERIA'.
'and' is the link.
(Other definitions for liberia that I've seen before include "part of Africa" , "West African country, capital Monrovia" , "West African country founded for freed slaves" , "African republic, capital Monrovia" , "W African Republic" .)