What does the cryptic crossword clue "Nationality of the enigmatic Mona Lisa? (8)" mean?

The definition is "Nationality". The wordplay uses an anagram. anagram of MONA + LISA? = SOMALIAN; definition: "Nationality" The answer is SOMALIAN.

Nationality of the enigmatic Mona Lisa? (8)

Guardian Cryptic #27308 | 7 Down | 2017-09-21 flower