Crossword Genius

Measure speed of fall? It's a bit stop start (4-5)

Ross

I believe the answer is:

time-lapse

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

'a bit stop start' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'measure speed of fall?' is the wordplay.
I cannot quite understand how this works, but
'measure' could be 'time' (timing is a kind of measuring) and 'time' is present in the answer.
'fall?' could be 'lapse' (I have seen 'Moral fall ' mean 'lapse' so perhaps 'fall' could also mean 'lapse') and 'lapse' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'it's' is the link.

Can you help me to learn more?

(Other definitions for time-lapse that I've seen before include "Photography technique" , "Kind of cinematic technique for showing a slow process at an accelerated pace" , "Photographic technique to show very slow processes in motion" .)

I've seen this clue in The Irish Times.
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