Legislation that went against the grain (4,4)

I believe the answer is:

corn laws

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'legislation that went against the grain' is the definition.
Although both the answer and 'legislation' are nouns, they are not in the same form of the noun.

'legislation that went against the grain' is the wordplay.
'legislation' becomes 'law' (I've seen this before).
'that went' becomes 's' (I can't justify this - if you can you should believe this answer much more).
'against' is a charade indicator (letters next to each other).
'the grain' becomes 'corn' (corn is a kind of grain).
'law'+'s'='laws'
'laws' put after 'corn' is 'CORN LAWS'.

Can you help me to learn more?

(Other definitions for corn laws that I've seen before include "Measures of protection" , "Legislation, once" .)

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

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