Ambled into a madhouse (6)

I believe the answer is:

bedlam

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

'madhouse' is the definition.
(I know that madhouse can be written as Bedlam)

'ambled into a' is the wordplay.
'ambled' anagrams to 'BEDLAM'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for bedlam that I've seen before include "Blamed for a lot of noise" , "Blamed for pandemonium" , "Blamed for intolerable noise" , "Blamed for noisy uproar" , "Loud confused noise" .)

I've seen this clue in The Globe and Mail.

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