Crossword Genius

Centuries galore? (4)

Ross

I believe the answer is:

tons

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

'centuries' is the definition.
The answer and definition can be both quantities as well as being plural nouns.
Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tons that I've seen before include "Lots" , "A lot" , "Each is equivalent to 2240 pounds" , "Loads (sl.)" .)

I've seen this clue in the Evening Standard.
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