Make better rascal ramble (7)

I believe the answer is:

improve

'make better' is the definition.
(synonyms)

'rascal ramble' is the wordplay.
'rascal' becomes 'imp' (synonyms).
'ramble' becomes 'rove' (synonyms).
'imp'+'rove'='IMPROVE'

(Other definitions for improve that I've seen before include "pick up" , "Train" , "Enhance" , "Make progress" , "Ameliorate" .)

I've seen this clue in The Daily Express.

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