Lack of interest in monkey eating duck (7)
I believe the answer is:
languor
'lack' is the definition.
(I have seen 'Lack of energy ' mean 'languor' so perhaps 'lack' could also mean 'languor')
'interest in monkey eating duck' is the wordplay.
I cannot quite understand how this works, but
'duck' could be 'o' (resembles zero - 'duck' in cricket) and 'o' is present in the answer.
'monkey' could be 'langur' (langur is a kind of monkey) and 'langur' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for languor that I've seen before include "Indolence" , "Weariness; relaxation" , "Apathy" , "tender softness" , "Lack of vitality, listlessness" .)