Consort of Cronus (4)
I believe the answer is:
rhea
'consort of cronus' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rhea that I've seen before include "Small 'ostrich'" , "Fast runner" , "South American flightless bird - mother of Zeus" , "S American runner" , "Moon" .)