Out of control Dubliner's out of control day (9)
I believe the answer is:
unbridled
'out of control' is the definition.
(thesaurus)
'dubliner's out of control day' is the wordplay.
'out of control' indicates an anagram.
'day' becomes 'd' (abbreviation for day).
'dubliner' with letters rearranged gives 'unbridle'.
'unbridle'+'d'='UNBRIDLED'
(Other definitions for unbridled that I've seen before include "Without constraint" , "Fully and freely" , "Not restrained or controlled" , "Without restraint, as horse may be" , "Unrestrained" .)