In the morning, finish - intended to lose a revision (9)
I believe the answer is:
amendment
'revision' is the definition.
(I've seen this before)
'in the morning finish intended to lose a' is the wordplay.
'in the morning' becomes 'am' (short for ante meridiem - before noon).
'finish' becomes 'end' (synonyms).
'intended' becomes 'meant' (to mean something is to intend it).
'to lose' indicates named letters should be taken away.
'meant' with 'a' taken out is 'ment'.
'am'+'end'+'ment'='AMENDMENT'
(Other definitions for amendment that I've seen before include "Revision" , "change for the better" , "Alteration made in a formal document" , "Corrective treatment" , "a bit of a change!" .)