Reptile farm ambassador goes around (5)
I believe the answer is:
mamba
'reptile' is the definition.
(mamba is a kind of reptile)
'farm ambassador goes around' is the wordplay.
'around' says the answer is hidden in the clue.
'MAMBA' is hidden within 'farm ambassador goes'.
(Other definitions for mamba that I've seen before include "Venomous snake; rhymes with dance" , "Deadly creature" , "It may be deadly" , "venomous crawler" , "Large African snake" .)