Fell apart when pass ran out (9)
I believe the answer is:
collapsed
'fell apart' is the definition.
(I've seen this before)
'pass ran out' is the wordplay.
'pass' becomes 'col' (col is a kind of pass).
'ran out' becomes 'lapsed' (lapsing is a kind of running out).
'col'+'lapsed'='COLLAPSED'
'when' acts as a link.
(Other definitions for collapsed that I've seen before include "Gave way, caved in" , "laid low" , "Cracked up - gave way" , "Fell apart" .)