A 5 letter English word.
Remove the first letter, and you will get the name of a country.
The last 3 letters give the opposite meaning of the word.
What is the 5 letter word?
The answer is:
Remove first and you get country name
Last three letters are
man (opposite of woman)
The other answer certainly fits in better, but I think this works too.
First letter removed then
NOMAN is MAN