Roguish artist’s friend, caught breaking in (8)

I believe the answer is:

rascally

'roguish' is the definition.
(synonyms)

'artist's friend caught breaking in' is the wordplay.
'artist's' becomes 'ras' (Royal Academician, member of Royal Academy of Arts).
'friend' becomes 'ally' (synonyms).
'caught' becomes 'c' (cricket abbreviation).
'breaking in' indicates putting letters inside.
'ras'+'ally'='rasally'
'rasally' enclosing 'c' is 'RASCALLY'.

(Another definition for rascally that I've seen is " Mischievous".)

I've seen this clue in The Times.

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