Crossword Genius

Jogging, pass some snakes (4)

Ross

I believe the answer is:

asps

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

'some snakes' is the definition.
(asp is a kind of snake)

'jogging pass' is the wordplay.
'pass' anagrams to 'ASPS'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for asps that I've seen before include "Cleopatra's cobras" , "Poplars" , "Poisonous snakes" , "Pass around the snakes" , "Small venomous snakes" .)

I've seen this clue in the Sydney Morning Herald.
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