Theresa is changing to radiators (7)

I believe the answer is:

heaters

'radiators' is the definition.
(I've seen this before)

'theresa is changing' is the wordplay.
'is changing' indicates an anagram.
'theresa' with letters rearranged gives 'HEATERS'.

'to' acts as a link.

(Other definitions for heaters that I've seen before include "Radiators" , "they keep warm)" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app