What does the cryptic crossword clue "Calling social worker to meet reticent person (7)" mean?

The wordplay uses a charade (building blocks). CLAM (synonym="CLAM") + ANT (synonym="ANT") = CLAMANT The answer is CLAMANT.

Calling social worker to meet reticent person (7)

Times Cryptic #28807 | 4 Across | 2024-01-08 flower