Pole among llamas tripped (4)
I believe the answer is:
mast
'pole' is the definition.
(mast is a kind of pole)
'among llamas tripped' is the wordplay.
'among' indicates the answer is hidden within the clue.
'MAST' can be found hidden inside 'llamas tripped'.
(Other definitions for mast that I've seen before include "pig-food" , "Main vertical spar of vessel" , "Tall radio transmitter" , "Vertical spar for supporting sails etc" , "Large transmitter" .)