Dismay, anxiety (13)
I believe the answer is:
consternation
I believe this clue is a double definition.
'dismay' is the first definition.
(synonyms)
'anxiety' is the second definition.
(I've seen this before)
(Other definitions for consternation that I've seen before include "Alarm" , "Dismay - cast-iron tenon (anag)" , "Feelings of dismay" , "Worry" , "Anxiety, dismay" .)