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Period drama's central character subjected to no peer pressure (6,3)

Ross

I believe the answer is:

common era

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'period' is the definition.
(common era is a kind of period)

I can't explain the rest of the clue.

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(Other definitions for common era that I've seen before include "In Christian times" , "this time" , "these days" .)

I've seen this clue in The Telegraph.
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