What does the cryptic crossword clue "Stagger northward over bad night in more rambling (9)" mean?

The wordplay uses an anagram. anagram of NGTHI (synonym="NGTHI") + LEER (synonym="LEER") = LENGTHIER The answer is LENGTHIER.

Stagger northward over bad night in more rambling (9)

Guardian Cryptic #29535 | 15 Down | 2024-11-08 flower