14 down
Blown
up
–
impact
spread
over
northern
Brussels
(9)
Blown up – impact spread over northern Brussels (9)
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The definition is at the beginning of the clue.
How the clue works
Right, so blown up is your definition here — think inflated, filled with air, pneumatic. For the wordplay, take IMPACT, add N for northern and EU for Brussels (the seat of the EU), then "spread" tells you to anagram the whole lot together, which gives you the answer.