The Crossword Centre Clue-Writing Competition

CCCWC January competition voters’ comments
 
Clue no. 12: Daft cow with field strength gets muddled and proves false (3.5)

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A clue to TWO-FACED.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.Surface doesn’t make sense
2.As a physics grad, I get field strength in wordplay, but what does it mean in the surface??
3.What is a cow with "field strength"?