Crossword Genius

Heaps of accidents (6)

Ross

I believe the answer is:

stacks

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

This could be a double definition.

'heaps' is the first definition.
('stack' can be a synonym of 'heap')

'accidents' is the second definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for stacks that I've seen before include "Large tall chimneys" , "bags?" , "Orderly heaps as of hay" , "Orderly piles or heaps" , "Ricks" .)

I've seen this clue in the Sydney Morning Herald.
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