Crossword Genius

Nasal discharge returns - and there's lots of it! (4)

Ross

I believe the answer is:

tons

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

'lots of it' is the definition.
'tons' can be an answer for 'lots' (I've seen this in another clue). I am unsure of the 'of it' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Irish Times.
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