Anne's upset about trap (7)
I believe the answer is:
ensnare
'trap' is the definition.
(I've seen this before)
'anne's upset about' is the wordplay.
'upset' indicates anagramming the letters.
'about' becomes 're' (regarding).
'annes' anagrammed gives 'ensna'.
'ensna'+'re'='ENSNARE'
(Other definitions for ensnare that I've seen before include "Capture, trap" , "Ecstatic expression of feeling" , "Catch as if in a trap or net" , "Ambush" .)