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Martial arts fellow and four interns on a sofa bed (5)

Ross

I believe the answer is:

divan

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

'bed' is the definition.
(type of bed)

'martial arts fellow and four interns on a sofa' is the wordplay.
I cannot really understand how this works, but
'fellow' could be 'ivan' (I've seen this before) and 'ivan' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.
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