Crossword Genius

Inn or brae running? That's a very simple decision! (2-7)

Ross

I believe the answer is:

no-brainer

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

'a very simple decision' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'inn or brae running?' is the wordplay.
'running?' is an anagram indicator.
'inn'+'or'+'brae'='innorbrae'
'innorbrae' is an anagram of 'NO-BRAINER'.

'that's' is the link.

Can you help me to learn more?

(Other definitions for no-brainer that I've seen before include "Something involving little or no mental effort" , "It's totally clear" , "Obvious choice" , "That which must be done, obviously" , "Something requiring little or no mental effort" .)

I've seen this clue in The Independent.
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