One with a serious part in reading at random (9)

I believe the answer is:

tragedian

I'm a little stuck... Click here to teach me more about this clue!

'one with a serious part' is the definition.
I can't tell whether this defines the answer.

'reading at random' is the wordplay.
'random' is an anagram indicator.
'reading'+'at'='readingat'
'readingat' anagrammed gives 'TRAGEDIAN'.

'in' is the link.

Can you help me to learn more?

(Other definitions for tragedian that I've seen before include "actor in Macbeth?" , "Serious actor" , "A great din (anag) - actor" , "Dramatist" , "Egad, I rant about actor in sad drama" .)

I've seen this clue in The Globe and Mail.

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