Rehashes vacuous routine on revolutions (8)
I believe the answer is:
recycles
'rehashes' is the definition.
The answer and definition can be both related to consumption as well as being verbs in their -s form.
Perhaps you can see a link between them that I don't see?
'vacuous routine on revolutions' is the wordplay.
'vacuous' says to hollow out the word (remove centre letters).
'on revolutions' becomes 'cycles' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'routine' with its middle taken out is 're'.
're'+'cycles'='RECYCLES'
Can you help me to learn more?
(Other definitions for recycles that I've seen before include "Uses again for another purpose" , "Acts eco-friendly" , "Converts waste material for use again" .)