Abstinence making office worker operate crane with energy (10)
I believe the answer is:
temperance
'abstinence' is the definition.
(I know that temperance is a type of abstinence)
'office worker operate crane with energy' is the wordplay.
'office worker' becomes 'temp' (temporary worker in an office).
'operate' indicates anagramming the letters.
'with' is an insertion indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'crane' is an anagram of 'rance'.
'rance' enclosing 'e' is 'erance'.
'temp'+'erance'='TEMPERANCE'
'making' is the link.
(Other definitions for temperance that I've seen before include "Lack of bottle" , "virtue?" , "for staying off drink" , "Moderation" , "Feature of traditional Methodism" .)