Tear grass (4)

I believe the answer is:

rush

This clue is a double definition.

'tear' is the first definition.
(thesaurus)

'grass' is the second definition.
(thesaurus)

(Other definitions for rush that I've seen before include "Speed along - waterside plant" , "Race" , "'Hurry, haste (4)'" , "Water plant; hurry" , "Hurry, surge" .)

I've seen this clue in The Telegraph.

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