Crossword Genius

Lots of trouble, fundamentally? (5)

Ross

I believe the answer is:

piles

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

'lots' is the definition.
('pile' can be a synonym of 'lot')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for piles that I've seen before include "complaint" , "Heaps" .)

I've seen this clue in The Independent.
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