Crossword Genius

Pass by failing to fail (8)


I believe the answer is:

'fail' is the definition.
(I've seen this before)

'pass by failing' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'by' means one lot of letters go next to another.
'failing' becomes 'lapse' (I've seen this before).

'to' is the link.

(Other definitions for collapse that I've seen before include "Fall down or lose strength suddenly", "Slump", "Give way, fail suddenly", "Fall or disintergrate", "Disintegration".)

I've seen this clue in The Guardian.