What does the cryptic crossword clue "Worry about Facebook owner’s identity tracker (4,3)" mean?

The wordplay uses a container (one word inside another). META (synonym="the American technology company that owns Facebook, the social media and networking service") in NAG (synonym="to persistently worry/trouble") = NAMETAG The answer is NAMETAG.

Worry about Facebook owner’s identity tracker (4,3)

Guardian Cryptic #29559 | 19 Down | 2024-12-06 flower

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