Stories of elite soldiers capturing a German leader (5)
I believe the answer is:
sagas
'stories' is the definition.
(saga is a kind of story)
'elite soldiers capturing a german leader' is the wordplay.
'elite soldiers' becomes 'sas' (Special Air Service).
'capturing' means one lot of letters goes inside another.
'leader' suggests taking the first letters.
The first letter of 'german' is 'g'.
'a'+'g'='ag'
'sas' enclosing 'ag' is 'SAGAS'.
'of' acts as a link.
(Other definitions for sagas that I've seen before include "Myths" , "Heroic tales" , "Long involved stories" , "Tales of heroes" .)