Live to be a RA working and introducing complicated designs (11)

I believe the answer is:

elaborative

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'introducing complicated designs' is the definition.
I can't tell whether this defines the answer.

'live to be a ra working' is the wordplay.
'working' indicates an anagram.
'live'+'to'+'be'+'a'+'ra'='livetobeara'
'livetobeara' with letters rearranged gives 'ELABORATIVE'.

'and' acts as a link.

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I've seen this clue in The Times.

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