Crossword Genius

When fastened, gave way (7)

Ross

I believe the answer is:

buckled

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'when fastened' is the first definition.
'buckled' can be an answer for 'fastened' (buckling is a kind of fastening). I am not sure about the 'when' bit.

'gave way' is the second definition.
(buckling is a kind of giving way)

Can you help me to learn more?

(Other definitions for buckled that I've seen before include "collapsed" , "Bent" , "Securely fastened" , "folded under pressure" , "Crumpled under pressure." .)

I've seen this clue in the Evening Standard.
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