Need roughly about a day to get it completed (5)
I believe the answer is:
ended
'completed' is the definition.
(synonyms)
'need roughly about a day to get it' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'need' is 'ende' which is within the answer.
'day' could be 'd' (abbreviation for day) and 'd' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ended that I've seen before include "Acclaim" , "'Our revels now are . . . . .' (The Tempest)" , "Finished, terminated" , "Brought to a finish" , "Concluded" .)