What does the cryptic crossword clue "Effect of a single legislator on law (6)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Effect of a single legislator on law (6)

Guardian Cryptic #27299 | 1 Down | 2017-09-11

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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

I MP [a single legislator] + ACT [law]

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Effect of a single legis­lator on law (6)

Effect of a single legislator on law (6)