Character in Othello reported noble group of stars (10)
I believe the answer is:
cassiopeia
'group of stars' is the definition.
(I know that Cassiopeia is a constellation)
'character in othello reported noble' is the wordplay.
'character in othello' becomes 'cassio' (Michael Cassio, character in Shakespeare's play).
'reported' indicates a 'sounds like' (homophone) clue.
'noble' becomes 'peer' (peers are members of the nobility).
'peer' sounds like 'peia'.
'cassio'+'peia'='CASSIOPEIA'
(Other definitions for cassiopeia that I've seen before include "Stellar group" , "heavenly figure" , "Northern constellation with five bright stars in a W shape" .)