Frank Ocean originally changed tune about heartless spook (9)
I believe the answer is:
outspoken
'frank' is the definition.
(I know that frank can be written as outspoken)
'ocean originally changed tune about heartless spook' is the wordplay.
'originally' indicates taking the first letters.
'changed' indicates an anagram.
'about' indicates putting letters inside.
'heartless' says to hollow out the word (remove centre letters).
'spook' with its centre taken out is 'spok'.
The initial letter of 'ocean' is 'o'.
'tune' is an anagram of 'uten'.
'uten' placed around 'spok' is 'utspoken'.
'o'+'utspoken'='OUTSPOKEN'
(Other definitions for outspoken that I've seen before include "Forthright, frank" , "Inclined to say exactly what one thinks" , "Bold in speech" , "Candid" , "bluff" .)