Crossword Genius

Making premature decision when parachute fails? (7,2,1,10)

Ross

I believe the answer is:

jumping to a conclusion

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

'parachute fails?' is the definition.
The definition suggests a singular noun which matches the answer.

'making premature decision' is the wordplay.
I cannot quite see how this works, but
'decision' could be 'conclusion' (synonyms) and 'conclusion' is located in the answer.
This explanation may well be incorrect...

'when' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app