Notes on article suited strange lethargy (9)
I believe the answer is:
lassitude
'lethargy' is the definition.
(I know that lethargy can be written as lassitude)
'notes on article suited strange' is the wordplay.
I cannot really see how this works, but
'notes' could be 'las' (more than one la, a musical note) and 'las' is located in the answer.
an anagram of 'suited' is 'situde' which is within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for lassitude that I've seen before include "Weariness" , "slackness" , "Weakness" , "30 [LETHARGY]" , "Lack of energy and enthusiasm" .)