What does the cryptic crossword clue "What priest may wear in bed, half so long (5)" mean?

The wordplay uses a charade (building blocks). COT (synonym="‘bed’") + TA (synonym="ta-ta, ‘half so long’") = COTTA The answer is COTTA.

What priest may wear in bed, half so long (5)

Guardian Cryptic #29498 | 24 Down | 2024-09-26 flower