What a nice clue the setter gave us for Jumbo Cryptic 1208 28 across!
"How a linesman ensures a fair result? (6,7) "
A: POETIC JUSTICE
This will join my favourite clues list along with:
"A dash for the takeaway." (5,4).
A: MINUS SIGN
And
"A genius who is a mug in his own country (8)"
A: EINSTEIN