Feline, large one, on English ship (7)
I believe the answer is:
lioness
'feline' is the definition.
(I know that lioness is a type of lion)
'large one on english ship' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'one' becomes 'i' (Roman numeral).
'english' becomes 'E' (abbreviation).
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'l'+'i'+'on'+'e'+'ss'='LIONESS'
(Other definitions for lioness that I've seen before include "Female pride member" , "Fierce female feline" , "Leo's mate" , "Female carnivore" , "Queen of beasts?" .)