Happy story reviewed by editor (6)
I believe the answer is:
elated
'happy' is the definition.
(similar in meaning)
'story reviewed by editor' is the wordplay.
'story' becomes 'tale' (synonyms).
'reviewed' is a reversal indicator.
'by' means one lot of letters go next to another.
'editor' becomes 'ed' (abbreviation).
'tale' back-to-front is 'elat'.
'elat'+'ed'='ELATED'
(Other definitions for elated that I've seen before include "Hyped up" , "Full of high-spirited delight" , "In an enraptured state" , "Exultant" , "Jubilant, overjoyed" .)