Martial arts fellow and four interns on a sofa bed (5)
I believe the answer is:
divan
'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" .)