Lost earring, more annoyed (7)
I believe the answer is:
angrier
'more annoyed' is the definition.
(more angry)
'lost earring' is the wordplay.
'lost' indicates anagramming the letters.
'earring' with letters rearranged gives 'ANGRIER'.
(Other definitions for angrier that I've seen before include "Not so calm" , "more outraged" , "More furious" , "More annoyed" , "More worked up" .)