Aspect of Trump: e-troll liable to explode, if fired up (6)

I believe the answer is:

petrol

I'm a little stuck... Click here to teach me more about this clue!

'aspect' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'trump e-troll liable to explode if fired up' is the wordplay.
'PETROL' is hidden in amongst the letters.
But, I'm unsure how the hidden word is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for petrol that I've seen before include "Liquid fuel" , "Common car fuel" , "Mineral oil refined as fuel" , "The juice" , "Gasoline" .)

I've seen this clue in The Guardian.

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