A Trojan hero rocked her cot (6)
I believe the answer is:
hector
'a trojan hero' is the definition.
(mythological figure)
'rocked her cot' is the wordplay.
'rocked' indicates anagramming the letters.
'her'+'cot'='hercot'
'hercot' anagrammed gives 'HECTOR'.
(Other definitions for hector that I've seen before include "do as Harrier does" , "Bully (someone) verbally" , "Trojan prince killed by Achilles at Troy - browbeat him" , "Greek fighter" , "King's son" .)