Am I nuts travelling around in large roller? (7)

I believe the answer is:

tsunami

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'large roller?' is the definition.
'tsunami' can be an answer for 'roller?' (thesaurus). I'm not sure about the 'large' bit.

'am i nuts travelling around' is the wordplay.
'travelling around' is an anagram indicator.
'am'+'i'+'nuts'='aminuts'
'aminuts' anagrammed gives 'TSUNAMI'.

'in' is the link.

Can you help me to learn more?

(Other definitions for tsunami that I've seen before include "Freak wave" , "big wave" , ""Harbour wave"" , "crashing bore" , "Huge destructive sea wave" .)

I've seen this clue in The Guardian.

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