May repackage heaters (7)
I believe the answer is:
theresa
'may' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I can't see?
'repackage heaters' is the wordplay.
'repackage' indicates an anagram (I've seen 'repackaged' mean this (I've seen this in other clues)).
'heaters' is an anagram of 'THERESA'.
Can you help me to learn more?
(Other definitions for theresa that I've seen before include "May's one" , "Maria -, Habsburg empress" , "Maria --, Austrian ruler" , "Maria ___ , Archduchess of Austria, d. 1780" , "Girl's name" .)