Express sympathy or pity (11)
I believe the answer is:
commiserate
I believe this is a double definition.
'express sympathy' is the first definition.
(I've seen this in another clue)
'pity' is the second definition.
(commiserating is a kind of pitying)
(Other definitions for commiserate that I've seen before include "demonstrate pity" , "Express sympathy" , "Sympathise" .)