Finish foreign article with cunning without limit (9)

I believe the answer is:

endlessly

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'without limit' is the definition.
(thesaurus)

'finish foreign article with cunning' is the wordplay.
'finish' becomes 'end' (synonyms).
'foreign article' becomes 'les'.
'with cunning' becomes 'sly' (synonyms. I am not sure about the 'with' bit.).
'end'+'les'+'sly'='ENDLESSLY'

Can you help me to learn more?

(Other definitions for endlessly that I've seen before include "forever?" , "in perpetuity" , "Ad infinitum" , "it's for ever" , "Limitlessly" .)

I've seen this clue in The Daily Express.

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