Could be a horse a bet's adapted for (5)

I believe the answer is:

beast

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

'adapted for' is the definition.
The definition suggests a singular noun which matches the answer.

'could be a horse a bet's' is the wordplay.
'a bet's' anagrams to 'BEAST'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for beast that I've seen before include "Inhumanly cruel person" , "Wild animal" , "Monster" , "Inhuman person" , "Nasty type" .)

I've seen this clue in the Evening Standard.

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