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Tirade I gathered filled with bitterness, primarily? (8)

Ross

I believe the answer is:

diatribe

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'tirade i gathered filled with bitterness primarily?' is the definition.
I can't tell whether this definition defines the answer.

'tirade i gathered filled with bitterness primarily?' is the wordplay.
'gathered' indicates anagramming the letters (the letters are gathered into a new order).
'filled with' means one lot of letters goes inside another.
'primarily?' says to take the initial letters (I've seen 'primarily' mean this).
The initial letter of 'bitterness' is 'b'.
'tirade'+'i'='tiradei'
'tiradei' is an anagram of 'diatrie'.
'diatrie' placed around 'b' is 'DIATRIBE'.

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(Other definitions for diatribe that I've seen before include "A Prolonged harangue" , "Abusive harangue" , "abusive outburst" , "I debar it, being a violent attack in words" , "Passionate words" .)

I've seen this clue in The Guardian.
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