The dangerous part is when you see red (5)

I believe the answer is:

anger

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'see red' is the definition.
(synonyms)

'the dangerous part' is the wordplay.
'part' indicates a hidden word.
'ANGER' can be found hidden inside 'dangerous'.

'is when you' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for anger that I've seen before include "Hostile feeling" , "Heat" , "Emotion" , "Spleen" , "There's fury" .)

I've seen this clue in the Evening Standard.

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