Erased last trace of coffee, with decaff sent back (7)
I believe the answer is:
effaced
'erased' is the definition.
('efface' can be a synonym of 'erase')
'last trace of coffee with decaff sent back' is the wordplay.
'last trace of' says to take the final letters.
'with' means one lot of letters go next to another.
'sent back' is a reversal indicator.
The last letter of 'coffee' is 'e'.
'decaff' written backwards gives 'ffaced'.
'e'+'ffaced'='EFFACED'
(Other definitions for effaced that I've seen before include "made to disappear" , "Expunged" , "Rubbed out, obliterated" , "Eradicated" , "Cafe fed wrongly and was rubbed out" .)