Be unable to contain one's rage – trudge in river (7)

I believe the answer is:

explode

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'be unable to contain one's rage' is the definition.
I can't tell whether this definition defines the answer.

'trudge in river' is the wordplay.
'trudge' becomes 'plod' (synonyms).
'in' is an insertion indicator.
'river' becomes 'exe' (River Exe).
'plod' inserted within 'exe' is 'EXPLODE'.

Can you help me to learn more?

(Other definitions for explode that I've seen before include "Blow up" , "Burst outward" , "mushroom" , "Go off with a bang" , "Set off" .)

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