...conclude, aggravates risks (9)

I believe the answer is:

endangers

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'risks' is the definition.
(I've seen this before)

'conclude aggravates' is the wordplay.
'conclude' becomes 'end' (I've seen this before).
'aggravates' becomes 'angers' (I can't explain this - if you can you should give a lot more credence to this answer).
'end'+'angers'='ENDANGERS'

Can you help me to learn more?

(Other definitions for endangers that I've seen before include "Puts in peril" , "poses a threat" , "Risks" , "Imperils" , "Puts into jeopardy" .)

I've seen this clue in The Daily Express.

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