What does the cryptic crossword clue "Slipped back (rush to guzzle drinks) (8)" mean?

The wordplay uses a container (one word inside another). LAPS (synonym="drinks") in REED (synonym="rush") = RELAPSED The answer is RELAPSED.

Slipped back (rush to guzzle drinks) (8)

Guardian Cryptic #29622 | 8 Down | 2025-02-19 flower