Fish: survivor of Tudor England? (4)
I believe the answer is:
parr
'fish' is the definition.
(I've seen this in other clues)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for parr that I've seen before include "Young salmon; Queen Catherine ---" , "old trout?" , "Young salmon with spots" , "Katherine --, last wife of Henry VIII" , "survivor of the decapitator?" .)