Sailors' stories, say, about the navy? (5)
I believe the answer is:
yarns
'sailors' stories' is the definition.
(I've seen this in another clue)
'say about the navy?' is the wordplay.
'say' becomes 'yas' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'the navy?' becomes 'RN' (abbreviation for Royal Navy).
'yas' enclosing 'rn' is 'YARNS'.
Can you help me to learn more?
(Other definitions for yarns that I've seen before include "Stories, threads" , "Anecdotes" , "Wools or stories" , "Threads spun from wool, cotton, etc." , "rambling stories" .)