Covering everything, generally speaking (2,3,5)
I believe the answer is:
on the whole
'generally speaking' is the definition.
(thesaurus)
'covering everything' is the wordplay.
'covering' becomes 'on'.
'everything' becomes 'thewhole' (I can't justify this - if you can you should give a lot more credence to this answer).
'on'+'thewhole'='ON THE WHOLE'
Can you help me to learn more?
(Other definitions for on the whole that I've seen before include "All things considered" , "Generally" , "First and last" , "In general" , "as a rule" .)