Jogging, pass some snakes (4)
I believe the answer is:
asps
'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" .)