A curious, empty-hearted person, possibly (7)
I believe the answer is:
snooper
'a curious' is the definition.
I can't tell whether this defines the answer.
'empty-hearted person possibly' is the wordplay.
'empty' becomes 'o'.
'hearted' indicates putting letters inside (some letters go to the heart of the word).
'possibly' indicates anagramming the letters.
'person' anagrammed gives 'snoper'.
'o' put within 'snoper' is 'SNOOPER'.
Can you help me to learn more?
(Other definitions for snooper that I've seen before include "Prying investigator" , "Prying person" , "Nosy individual" , "Furtive investigator" , "One spying" .)