Crossword Genius

It's common sense, that's why! (6)

Ross

I believe the answer is:

reason

I believe this clue is a double definition.

'it's common sense' is the first definition.
(thesaurus)

'why' is the second definition.
(thesaurus)

'that's' acts as a link.

(Other definitions for reason that I've seen before include "Incentive" , "Motive; argue" , "Justification or motive" , "'Motivation, grounds (6)'" , "Explanation; logic" .)

I've seen this clue in the Evening Standard.
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