Burdensome without more from lounger (6)
I believe the answer is:
sunbed
'burdensome' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally mean the same thing.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for sunbed that I've seen before include "Tanner's support" , "Tanning lounger" , "On which to get a tan" , "Tanner's lounger" , "Means of acquiring a tan" .)