Idleness at work (8)
I believe the answer is:
inaction
'idleness' is the definition.
(thesaurus)
'at work' is the wordplay.
'at' becomes 'in' (synonymous in some cases - eg at school, in school).
'work' becomes 'action' (I am not sure about this - if you are sure you should believe this answer much more).
'in'+'action'='INACTION'
Can you help me to learn more?
(Other definitions for inaction that I've seen before include "Sloth" , "Sluggishness" , "Idleness of nicotian sort" , "Failure to do anything" , "Passivity, doing nothing" .)