Branch officers initially anger cabinet (7)
I believe the answer is:
armoire
'cabinet' is the definition.
(thesaurus)
'branch officers initially anger' is the wordplay.
'branch' becomes 'arm' ('arm' can be a synonym of 'branch').
'initially' indicates taking the first letters.
'anger' becomes 'ire' ('ire' can be a synonym of 'anger').
The first letter of 'officers' is 'o'.
'arm'+'o'+'ire'='ARMOIRE'
(Other definitions for armoire that I've seen before include "Large wardrobe - more air (anag)" , "Large wardrobe or cabinet" , "Cupboard" , "item of furniture" , "Cabinet originally used for storing weapons" .)