Do fully, just the same (5)
I believe the answer is:
ditto
This clue might be a double definition.
'do fully' is the first definition.
'ditto' can be an answer for 'do' (I've seen this before). I am unsure of the 'fully' bit.
'just the same' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for ditto that I've seen before include "As per previous" , "Two dots say same again" , "In lists, the same again with two small marks" , "Do alternative" , "couple of marks" .)