Fabric imposing huge weight on bed (6)
I believe the answer is:
cotton
'fabric' is the definition.
(I know that cotton is a type of fabric)
'weight on bed' is the wordplay.
'weight' becomes 'ton' (unit of weight).
'on' means one lot of letters go next to another.
'bed' becomes 'cot' (cot is a type of bed).
'ton' put after 'cot' is 'COTTON'.
'imposing huge' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for cotton that I've seen before include "Fabric woven from plant fibres" , "Fabric (of natural fibre)" , "Natural textile fibre" , "Source of cloth" , "Golfing man" .)