One more heat Ron organised (7)
I believe the answer is:
another
'one more' is the definition.
(another means one more)
'heat ron organised' is the wordplay.
'organised' is an anagram indicator.
'heat'+'ron'='heatron'
'heatron' with letters rearranged gives 'ANOTHER'.
(Other definitions for another that I've seen before include "Player or person not yet named or selected" , "Additional: alternative" , "Somebody else" , "Additional, one more" , "A further (item)" .)