It comfortably supports many a Russian (5)

I believe the answer is:

divan

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'it comfortably supports' is the definition.
The definition suggests a singular noun which matches the answer.

'many a russian' is the wordplay.
'many' becomes 'D' (Roman numeral for 500).
'a russian' becomes 'Ivan' (common Russian name).
'd'+'ivan'='DIVAN'

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(Other definitions for divan that I've seen before include "Backless seat; bed" , "Couch - bed" , "Sideless, backless couch" , "resting place" , "Sort of bed" .)

I've seen this clue in the Evening Standard.

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