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Investigator arresting a nationalist giving French stick? (4)

Ross

I believe the answer is:

pain

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'french stick?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

'investigator arresting a nationalist' is the wordplay.
'investigator' becomes 'PI' (private investigator).
'arresting' means one lot of letters goes inside another.
'nationalist' becomes 'n' (abbreviation in politics).
'pi' enclosing 'a' is 'pai'.
'pai'+'n'='PAIN'

'giving' acts as a link.

Can you help me to learn more?

(Other definitions for pain that I've seen before include "French bread?" , "Unpleasant sensation" , "Agony" , "Mental distress" , "can cause discomfort" .)

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