Senior citizen taken in by soldiers (5)
I believe the answer is:
oldie
'senior citizen' is the definition.
(I've seen this before)
'taken in by soldiers' is the wordplay.
'taken in by' indicates a hidden word.
'OLDIE' can be found hidden inside 'soldiers'.
(Other definitions for oldie that I've seen before include "The --, UK magazine" , "Venerable person/thing" , "one who is past it?" , "Publication" , "Person of a certain age?" .)