Most horrible tale is best rewritten (10)

I believe the answer is:

beastliest

'most horrible' is the definition.
(I've seen this before)

'tale is best rewritten' is the wordplay.
'rewritten' indicates an anagram.
'tale'+'is'+'best'='taleisbest'
'taleisbest' is an anagram of 'BEASTLIEST'.

(Another definition for beastliest that I've seen is " Most horrible".)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app