Schedule when match or rearranged heat may end (4,3,3)
I believe the answer is:
name the day
'schedule when match' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'rearranged heat may end' is the wordplay.
'rearranged' indicates anagramming the letters.
'heat'+'may'+'end'='heatmayend'
'heatmayend' is an anagram of 'NAME THE DAY'.
'or' is the link.
Can you help me to learn more?
(Other definitions for name the day that I've seen before include "Go public on match fixing" , "Choose wedding date" , "Fix date for wedding" , "Say when you intend to get married" , "schedule the ceremony" .)