A goddess intended to be heartless for fun (9)
I believe the answer is:
amusement
'fun' is the definition.
(thesaurus)
'a goddess intended to be heartless' is the wordplay.
'goddess' becomes 'muse' (I've seen this in other clues**).
'intended' becomes 'meant' (meaning is a kind of intending).
'to be heartless' suggests removing the centre.
'meant' with its middle taken out is 'ment'.
'a'+'muse'+'ment'='AMUSEMENT'
'for' acts as a link.
(Other definitions for amusement that I've seen before include "Light-hearted pastime" , "enjoyment for 19 > [(type of) PARK]" , "(State of) finding something funny" , "Interest" , "Entertainment" .)