Possible Clues:

• Like the Fr. “la” and Ger. “die”
• Member of many an LGBT couple
• Like waitresses: Abbr.
• Neither masc. nor neut.
• Like some Sp. nouns
• Like an executrix: Abbr.
• Like most Italian singular nouns finishing in -a: Abbr
• Like about half the world's pop.
• Like la mer: Abbr.
• Like most Spanish nouns ending in "a": abbr.