Blessed group, a subject central to Chekov (3,4)

I believe the answer is:

the meek

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'blessed group a' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'subject central to chekov' is the wordplay.
'subject' becomes 'theme' (theme can mean a topic or subject).
'central' indicates the central letters.
The centre of 'chekov' is 'ek'.
'theme'+'ek'='THE MEEK'

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I've seen this clue in The Guardian.

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