A goddess intended heartless fun (9)
I believe the answer is:
amusement
'fun' is the definition.
(amusement is fun or enjoyment)
'a goddess intended heartless' is the wordplay.
'goddess' becomes 'muse' (I've seen this in other clues).
'intended' becomes 'meant' (to mean something is to intend it).
'heartless' says to hollow out the word (remove centre letters).
'meant' with its centre removed is 'ment'.
'a'+'muse'+'ment'='AMUSEMENT'
(Other definitions for amusement that I've seen before include "Idle wasting of time" , "Pleasure, diversion" , "Pleasant diversion by mute means (9)" , "enjoyment for 19 > [(type of) PARK]" , "Interest" .)