Crossword Genius

Boastful talk securing a post (8)

Ross

I believe the answer is:

baluster

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'post' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for baluster that I've seen before include "post" , "Rail hold-up" , "column" , "This could hold up rail" , "pillar of support" .)

I've seen this clue in The Times.
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