Romantic details I falsified (8)
I believe the answer is:
idealist
'romantic' is the definition.
(I've seen this in another clue)
'details i falsified' is the wordplay.
'falsified' is an anagram indicator.
'details'+'i'='detailsi'
'detailsi' is an anagram of 'IDEALIST'.
(Other definitions for idealist that I've seen before include "One seeking perfection" , "One who aims for perfection, may be unrealistic" , "Perfectionist" , "Person who acts from the highest motivations" , "Utopian" .)