Tidy Berliner article found in airport (7)
I believe the answer is:
orderly
'tidy' is the definition.
(similar in meaning)
'berliner article found in airport' is the wordplay.
'berliner article' becomes 'der' ('der' is a definite article in German).
'found in' indicates putting letters inside.
'airport' becomes 'orly' (French airport).
'der' inserted inside 'orly' is 'ORDERLY'.
(Other definitions for orderly that I've seen before include "Well-regulated" , "Junior Army rank" , "He should leave the ward neat" , "Tidy officer's attendant" , "in a mess? No" .)