Personnel I introduced to television editor flourished (7)
I believe the answer is:
thrived
'flourished' is the definition.
('thrive' can be a synonym of 'flourish')
'personnel i introduced to television editor' is the wordplay.
'personnel' becomes 'HR' (Human Resources).
'introduced to' indicates putting letters inside.
'television' becomes 'tv' (abbreviation).
'editor' becomes 'ed' (abbreviation).
'hr'+'i'='hri'
'hri' put into 'tv' is 'thriv'.
'thriv'+'ed'='THRIVED'
(Other definitions for thrived that I've seen before include "Grew rich" , "Prospered" , "Hired TV (anag.)" .)