Stories of a wartime gunner in the SAS (5)
I believe the answer is:
sagas
'stories' is the definition.
(saga is a kind of story)
'a wartime gunner in the sas' is the wordplay.
'a wartime gunner' becomes 'ga' (I can't justify this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'ga' placed inside 'sas' is 'SAGAS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for sagas that I've seen before include "Tales of heroes" , "Heroic tales" , "Long involved stories" , "Myths" .)