Crossword Genius

Walking exercise within the (American) law (14)

Ross

I believe the answer is:

constitutional

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

'walking exercise' is the definition.
'constitutional' can be an answer for 'exercise' (I've seen this before). I am not sure about the 'walking' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for constitutional that I've seen before include "Principled" , "A walk taken for its benefit to health" , "steps taken to improve health" , "authorised by the body politic" , "within the law" .)

I've seen this clue in the Sydney Morning Herald.
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