That presents no difficulty on waste ground (2,5)
I believe the answer is:
no sweat
'that presents no difficulty' is the definition.
I know nothing about this answer so I can't judge whether this works.
'on waste ground' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'on'+'waste'='onwaste'
'onwaste' is an anagram of 'NO SWEAT'.
Can you help me to learn more?
(Other definitions for no sweat that I've seen before include "Don't worry" , "That won't be a problem" , "OK" , "It's not a problem (result of using antiperspirant?)" , "There shouldn't be any objection" .)