View on hospital department's mix up (8)
I believe the answer is:
entangle
'mix up' is the definition.
(thesaurus)
'view on hospital department's' is the wordplay.
'view' becomes 'angle' (angle is a kind of view**).
'on' means one lot of letters go next to another.
'hospital department' becomes 'ent'.
'angle' after 'ent' is 'ENTANGLE'.
(Other definitions for entangle that I've seen before include "Ravel" , "Snare" , "Involve in complicated circumstances" , "Twist together into a confusing mass" , "caught up" .)