Honey-badger gets speed on line (5)
I believe the answer is:
ratel
'honey-badger' is the definition.
(I've seen this before)
'speed on line' is the wordplay.
'speed' becomes 'rate' (rate is a kind of speed**).
'on' says to put letters next to each other.
'line' becomes 'l'.
'rate'+'l'='RATEL'
'gets' is the link.
(Other definitions for ratel that I've seen before include "animal like a badger" , "Mammal's" , "Badger-like animal" , "one wanting honey" , "Badger-like mammal" .)