He gets a zero mark (5)

I believe the answer is:

oscar

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'he' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'a zero mark' is the wordplay.
'a zero' becomes 'o'.
'mark' becomes 'scar' ('scar' can be a synonym of 'mark'**).
'o'+'scar'='OSCAR'

'gets' acts as a link.

Can you help me to learn more?

(Other definitions for oscar that I've seen before include "-- Wilde, author" , "Librettist Hammerstein, d. 1960" , "Note" , "Film industry award" , "Film award; --- Hammerstein" .)

I've seen this clue in the Evening Standard.

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