Fiddling cars for a friend is dishonest (8)

I believe the answer is:

rascally

'dishonest' is the definition.
(similar in meaning)

'fiddling cars for a friend' is the wordplay.
'fiddling' indicates anagramming the letters.
'for' says to put letters next to each other.
'a friend' becomes 'ally' (an ally is a friend or supporter).
'cars' is an anagram of 'rasc'.
'rasc'+'ally'='RASCALLY'

'is' acts as a link.

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

I've seen this clue in the Evening Standard.

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