Tell a story about a ship for a girl (6)
I believe the answer is:
lassie
'girl' is the definition.
(I know that girl can be written as lassie)
'tell a story about a ship' is the wordplay.
'tell a story' becomes 'lie' (to tell stories is to lie).
'about' is an insertion indicator.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'a'+'ss'='ass'
'lie' enclosing 'ass' is 'LASSIE'.
'for a' is the link.
(Other definitions for lassie that I've seen before include "Hollywood film-star dog" , "Film and TV dog" , "TV series/film dog" , "Screen mutt - Scottish girl" , "Young Scottish female" .)