Races possibly still getting heartless threats (6)
I believe the answer is:
events
'races possibly' is the definition.
(race is a kind of event)
'still getting heartless threats' is the wordplay.
'still' becomes 'even' (synonyms).
'getting' says to put letters next to each other.
'heartless' says to hollow out the word (remove centre letters).
'threats' with its centre removed is 'ts'.
'even'+'ts'='EVENTS'
(Other definitions for events that I've seen before include "Occurences, happenings" , "Important happenings or incidents" , "Noteworthy happenings" , "They happen at a given place and time" , "Incidents, occasions" .)