Charlie in Hearts goal upended prophet (5)
I believe the answer is:
micah
'prophet' is the definition.
(I know that Micah is a prophet)
'charlie in hearts goal upended' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet).
'in' indicates putting letters inside.
'hearts' becomes 'h' (abbreviation used in card games e.g. bridge).
'goal' becomes 'aim' (aim is a kind of goal).
'upended' says the letters should be written backwards (in a down clue, letters go up).
'h'+'aim'='haim'
'c' inserted within 'haim' is 'hacim'.
'hacim' back-to-front is 'MICAH'.
(Other definitions for micah that I've seen before include "Bookmaker" , "Old Testament prophet" , "set of books" , "Hebrew prophet; OT book" , "Old Testament book" .)