Young creatures found aboard mythical vessel (6)
I believe the answer is:
calves
'young creatures' is the definition.
'calves' can be an answer for 'creatures' (calf is a kind of creature). I am unsure of the 'young' bit.
'found aboard mythical vessel' is the wordplay.
'found' indicates a hidden word.
'CALVES' is hidden in the letters of 'aboard mythical vessel'.
Can you help me to learn more?
(Other definitions for calves that I've seen before include "Young farm animals" , "Young domestic cattle" , "Young cows" , "features of legs" , "Small and neat" .)