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18d Guttering is given hanging support when crossing passage (8)

S?A?L?NG

Hanging support suggests NAIL to me - which gives SNAILING ... but I can't figure the rest. Am I missing something obvious, no one else seems to have had trouble with this clue.

swayling

sorry - meant to add - sling is the support

Thank you, scarlett!

My crossword solver TEA did suggest that amongst many other suggestions, I just didn't slog through checking them all in Chambers!