Long speech intended to delay parliamentary progress (10)

I believe the answer is:

filibuster

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'long speech' is the definition.
'filibuster' can be an answer for 'speech' (thesaurus). I am not certain of the 'long' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for filibuster that I've seen before include "delaying manoeuvre" , "delaying tactics" , "Mercenary" , "Delaying tactic to obstruct legislation" , "Waste time by making long speeches" .)

I've seen this clue in The Times.

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