Carnival could be reorganised to make it safe (6)
I believe the answer is:
fiesta
'carnival' is the definition.
(I've seen this before)
'could be reorganised to make it safe' is the wordplay.
'could be reorganised to make' is an anagram indicator.
'it'+'safe'='itsafe'
'itsafe' with letters rearranged gives 'FIESTA'.
(Other definitions for fiesta that I've seen before include "religious celebration" , "Public celebration in Spain" , "Elaborate public party, in Spain perhaps" , "Religious event" , "foreign holiday" .)