Crossword Genius

Intransigent troublemaker left a message (10)

Ross

I believe the answer is:

implacable

'intransigent' is the definition.
(thesaurus)

'troublemaker left a message' is the wordplay.
'troublemaker' becomes 'imp' (I've seen this before).
'left' becomes 'l' (common abbreviation).
'message' becomes 'cable' (cable is a kind of message**).
'imp'+'l'+'a'+'cable'='IMPLACABLE'

(Other definitions for implacable that I've seen before include "unable to be stopped" , "Unable to be appeased" , "Totally unrelenting" , "adamant" , "Relentless" .)

I've seen this clue in The Times.
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