Thrilled to interrogate English political party

I believe the answer is:

pumpedup

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'thrilled' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'interrogate english political party' is the wordplay.
'interrogate' becomes 'pump' (I can't explain this - if you can you should believe this answer much more).
'english' becomes 'e' (abbreviation).
'political party' becomes 'DUP' (Democratic Unionist Party).
'pump'+'e'+'dup'='PUMPED-UP'

'to' is the link.

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I've seen this clue in The Daily Mail.

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