Adaptable furniture fun to convert (5)
I believe the answer is:
futon
'adaptable furniture' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'fun to convert' is the wordplay.
'convert' is an anagram indicator (I've seen 'converted' mean this).
'fun'+'to'='funto'
'funto' with letters rearranged gives 'FUTON'.
Can you help me to learn more?
(Other definitions for futon that I've seen before include "Kind of Japanese chair-bed" , "Type of sofa bed" , "Japanese floor-mattress" , "Japanese sofa bed" , "'Japanese mattress, can be folded (5)'" .)