Short article, very dry, about opening of parliament (6)
I believe the answer is:
abrupt
'short' is the definition.
(thesaurus)
'article very dry about opening of parliament' is the wordplay.
'article' becomes 'a' (indefinite article).
'very dry' becomes 'brut' (I've seen this before).
'about' means one lot of letters goes inside another.
'opening of' suggests taking the first letters.
The first letter of 'parliament' is 'p'.
'brut' enclosing 'p' is 'brupt'.
'a'+'brupt'='ABRUPT'
(Other definitions for abrupt that I've seen before include "using minimal language?" , "Rough and quick" , "Terse and sudden" , "Short and brusque" , "Sudden, maybe discourteous" .)