Commotion as new edition of Chambers left 'hospital' out (8)
I believe the answer is:
scramble
'commotion' is the definition.
(thesaurus)
'new edition of chambers left hospital out' is the wordplay.
'new edition of' is an anagram indicator.
'left' becomes 'l' (common abbreviation).
'hospital' becomes 'h'.
'out' indicates named letters should be taken away.
'chambers'+'l'='chambersl'
'chambersl' with 'h' taken out is 'cambersl'.
'cambersl' is an anagram of 'SCRAMBLE'.
'as' acts as a link.
(Other definitions for scramble that I've seen before include "Make one's way quickly or awkwardly up a steep gradient" , "Jockey for position" , "Take off immediately" , "Make muddled" , "Clambers up in hurried climb" .)