Nod off ignoring naughty innuendo in boredom (5)
I believe the answer is:
ennui
'boredom' is the definition.
(synonyms)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ennui that I've seen before include "Feeling of listlessness" , "depression" , "Listless feeling" , "Boredom in France" , "Boredom, dullness" .)