Crossword Genius

Trouble from a guerilla (4)

Ross

I believe the answer is:

ague

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'trouble' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'a guerilla' is the wordplay.
'guerilla' becomes 'gue' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'gue'='AGUE'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for ague that I've seen before include "Old word for fever" , "Fit of the shakes" , "Malarial fever; chill" , "attack" , "Sickness" .)

I've seen this clue in the Evening Standard.
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