Perhaps the Prince of Wales possesses a recipe for cordial (4)
I believe the answer is:
warm
'for cordial' is the definition.
(synonym)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for warm that I've seen before include "Affectionate - balmy" , "(Of a scent) fresh" , "Cordial" , "showing enthusiasm" , "Near to finding hidden object" .)