Crossword Genius

Edison worked in a lawful position (6)

Ross

I believe the answer is:

onside

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

'in a lawful position' is the definition.
I can't tell whether this definition defines the answer.

'edison worked' is the wordplay.
'worked' indicates an anagram.
'edison' is an anagram of 'ONSIDE'.

Can you help me to learn more?

(Other definitions for onside that I've seen before include "Cricket's leg" , "Legally positioned on field" , "not breaking rules" , "legitimate" , "is in state to continue playing" .)

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