Burst of anger when of cost of transport round Lima is high (5-2)

I believe the answer is:

flare-up

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'burst' is the definition.
(I know that burst can be written as flare-up)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for flare-up that I've seen before include "Sudden outburst" , "Explosion of emotion" , "Sudden outbreak of anger" , "Suddenly burn brightly" , "Burst into flame or become suddenly angry" .)

I've seen this clue in the Sydney Morning Herald.

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