Crossword Genius

Rush at unusual rate (4)

Ross

I believe the answer is:

tear

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'rush' is the definition.
(I know that tear is a more specific form of rush)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tear that I've seen before include "Rate (anag.)" , "It's secreted by the lachrymal gland" , "A rip and a sign of sadness" , "Drop secreted by the lacrimal glands" , "Secretion of the lachrymal glands" .)

I've seen this clue in The Mirror.
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