An upright member in charge is virtuous (7)
I believe the answer is:
angelic
'virtuous' is the definition.
(angelic can mean behaving like an angel)
'an upright member in charge' is the wordplay.
'upright' shows that the letters should be reversed in order (in a down clue, letters go up).
'member' becomes 'leg' (member can mean a limb).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'leg' written backwards gives 'gel'.
'an'+'gel'+'ic'='ANGELIC'
'is' is the link.
(Other definitions for angelic that I've seen before include "Beautiful and innocent" , "Saint-like" , "Of innocent beauty" , "Pure; innocent" , "Saintly" .)