What does the cryptic crossword clue "Remain after revolution in support of a landlocked country (7)" mean?

The definition is "country". The wordplay uses an anagram. anagram of REMAIN + A = ARMENIA; definition: "country" The answer is ARMENIA.

Remain after revolution in support of a landlocked country (7)

Daily Mail Cryptic #17299 | 27 Across | 2024-02-22 flower