Fellows, to me, running round to get souvenir (7)
I believe the answer is:
memento
'souvenir' is the definition.
(I know that souvenir can be written as memento)
'fellows to me running round' is the wordplay.
'fellows' becomes 'men' (fellow can mean a man).
'running' indicates anagramming the letters (the letters run around to different places).
'round' indicates putting letters inside.
'to'+'me'='tome'
'tome' with letters rearranged gives 'meto'.
'men' going within 'meto' is 'MEMENTO'.
'to get' is the link.
(Other definitions for memento that I've seen before include "trophy" , "Reminder that death is inevitable" , "Souvenir, something to remember by" , "Something kept" , "Souvenir, reminder of past events" .)