Henry VIII's sixth wife (4)
I believe the answer is:
parr
'henry viii's sixth wife' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for parr that I've seen before include "Henry VIII's sixth queen" , "Catherine --, Henry VIII's sixth wife" , "Catherine --, last wife of Henry VIII" , "Henry's sixth (his third 7!)" , "Young salmon with spots" .)