Dubious plastic surgeon won't take tonics recommended for light sleeper (8)
I believe the answer is:
earplugs
'recommended for light sleeper' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'dubious plastic surgeon won't take tonics' is the wordplay.
'dubious' indicates anagramming the letters.
'won't take' is a deletion indicator.
'plastic'+'surgeon'='plasticsurgeon'
'plasticsurgeon' with 'tonics' taken away is 'plasurge'.
'plasurge' is an anagram of 'EARPLUGS'.
Can you help me to learn more?
(Other definitions for earplugs that I've seen before include "aids to sleep?" , "Stoppers to keep noise out" , "noise abatement aids" .)