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Pride’s initial spur for his historical act? (5)

Ross

I believe the answer is:

purge

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'his historical act?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'pride's initial spur' is the wordplay.
'initial' indicates taking the first letters.
'spur' becomes 'urge' (I've seen this before).
The first letter of 'prides' is 'p'.
'p'+'urge'='PURGE'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for purge that I've seen before include "Cleanse, purify" , "Purify from sin or guilt" , "Remove impurities from" , "Removal by cleansing" , "Cleanse of unwanted elements" .)

I've seen this clue in The Times.
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