Crossword Genius

I have followed the law of movement (6)

Ross

I believe the answer is:

active

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'movement' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'i have followed the law' is the wordplay.
'i have' becomes 'I've' (contraction of 'I have').
'followed' is a charade indicator (letters next to each other).
'the law' becomes 'act' (I've seen this before).
'ive' put after 'act' is 'ACTIVE'.

'of' is the link.

Can you help me to learn more?

(Other definitions for active that I've seen before include "kind of voice" , "Keeping busy, not lazy" , "Lively, working away" , "Dynamic, functioning" , "Moving, doing things" .)

I've seen this clue in The Irish Independent.
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