Ground ends tundra (10)
I believe the answer is:
understand
'ground ends tundra' is the definition.
Although both the answer and 'ground' are verbs, they are not in the same form of the verb.
'ground ends tundra' is the wordplay.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'ends'+'tundra'='endstundra'
'endstundra' anagrammed gives 'UNDERSTAND'.
Can you help me to learn more?
(Other definitions for understand that I've seen before include "Grasp - sympathise" , "Twig" , "Get the message" , "Make sense of" , "Perceive the meaning of" .)