Getting rascal to wander is better (7)
I believe the answer is:
improve
'is better' is the definition.
(I've seen this before)
'getting rascal to wander' is the wordplay.
I cannot quite understand how this works, but
'rascal' could be 'imp' (synonyms) and 'imp' is found in the answer.
'wander' could be 'rove' (synonyms) and 'rove' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for improve that I've seen before include "reform" , "Become better" , "Polish" , "Enhance" , "Get or make better" .)