Went berserk as the walkway got so old (8)

I believe the answer is:

rampaged

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

'went berserk' is the definition.
(I've seen this before)

'the walkway got so old' is the wordplay.
'the walkway' becomes 'ramp' (I've seen this in another clue).
'got' means one lot of letters go next to another.
'so old' becomes 'aged' (similar in meaning. I am not sure about the 'so' bit.).
'ramp'+'aged'='RAMPAGED'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for rampaged that I've seen before include "Rushed wildly" , "Charged" , "ran riot" , "Went berserk" , "ran amok" .)

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

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