Worried about being visibly embarrassed (5)
I believe the answer is:
cared
'worried' is the definition.
'about being visibly embarrassed' is the wordplay.
'about' becomes 'ca' (abbreviation for 'circa').
'being visibly embarrassed' becomes 'red'.
'ca'+'red'='CARED'
(Other definitions for cared that I've seen before include "Was concerned" , "had feelings" , "Felt concern or interest" , "Tended" , "Felt affection (for)" .)