A saucy artist enthralling you with line of crack? (9)

I believe the answer is:

apertural

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'enthralling you with line of crack?' is the definition.
I can't tell whether this definition defines the answer.

'a saucy artist' is the wordplay.
'saucy' becomes 'pert' (synonyms).
'artist' becomes 'ural' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'pert'+'ural'='APERTURAL'

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I've seen this clue in The Independent.

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