Temperature on Blue Nile turned boiling (9)
I believe the answer is:
ebullient
'boiling' is the definition.
(thesaurus)
'temperature on blue nile turned' is the wordplay.
'temperature' becomes 't' (abbreviation).
'on' says to put letters next to each other.
'turned' indicates an anagram.
'blue'+'nile'='bluenile'
'bluenile' is an anagram of 'ebullien'.
't' after 'ebullien' is 'EBULLIENT'.
(Other definitions for ebullient that I've seen before include "Enthusiastic" , "cock- a-hoop" , "Bubbling with enthusiasm" , "bright and breezy?" , "Joyously unrestrained" .)