Do well dividing four-fifths of one plus two by four (6)
I believe the answer is:
thrive
'do well' is the definition.
(to thrive is to succeed or develop well)
'dividing four-fifths of one plus two by four' is the wordplay.
I cannot quite see how this works, but
'four' could be 'iv' (Roman numerals for four) and 'iv' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for thrive that I've seen before include "Prosper, grow well" , "Be successful" , "Do well, flourish" , "Hit rev in order to prosper" , "Prosper, flourish" .)