Neat piece of software featuring in German article (6)
I believe the answer is:
dapper
'neat' is the definition.
(thesaurus)
'piece of software featuring in german article' is the wordplay.
'piece of software' becomes 'app' (an app is a computer programme).
'featuring in' indicates putting letters inside.
'german article' becomes 'der' (definite article in German).
'app' placed within 'der' is 'DAPPER'.
(Other definitions for dapper that I've seen before include "Debonair" , "angler letting bait bob on water?" , "Neat, spruce" , "Rakish" , "neat and smart in dress" .)