Branch office's head in a state of uncertainty (5)
I believe the answer is:
limbo
'a state of uncertainty' is the definition.
(I've seen this before)
'branch office's head' is the wordplay.
'branch' becomes 'limb' (I've seen this before).
'head' says to take the initial letters.
The first letter of 'offices' is 'o'.
'limb'+'o'='LIMBO'
'in' acts as a link.
(Other definitions for limbo that I've seen before include "Period of uncertainty" , "Intermediate state; obscurity" , "Once supposed abode of the souls of unbaptized infants" , "dance in West Indies" , "Uncertain or intermediate state" .)