Soldier welcoming group of fliers with appropriate tags (8)
I believe the answer is:
graffiti
'tags' is the definition.
(I know this)
'soldier welcoming group of fliers with appropriate' is the wordplay.
'soldier' becomes 'GI' (GI can mean a US soldier).
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'group of fliers' becomes 'RAF' (Royal Air Force).
'with' is a charade indicator (letters next to each other).
'appropriate' becomes 'fit' (similar in meaning).
'raf'+'fit'='raffit'
'gi' enclosing 'raffit' is 'GRAFFITI'.
(Other definitions for graffiti that I've seen before include "Wall scribbles" , "Wall scribblings" , "Writings on wall" , "Unauthorised public writing" , "Writing on the wall" .)