Again, many are looking embarrassed (3)
I believe the answer is:
red
'looking embarrassed' is the definition.
(someone may go red when embarrassed)
'again many' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'many' becomes 'd' (Roman numeral for 500).
're'+'d'='RED'
'are' is the link.
(Other definitions for red that I've seen before include "Colour of a cardinal's hat" , "Primary colour" , "Blood-coloured" , "The colour of the former Russian army" , "Very angry, seeing this" .)