19 down
Neil
cooked
oats,
maybe
to
control
character
(4,4)
Neil cooked oats, maybe to control character (4,4)
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The definition is at the end of the clue.
How the clue works
control character is your definition — LINE FEED being that ASCII computing term you half-remember from the old days. Anagram Neil (that's your "cooked" signal) to get LINE, then oats, maybe gives you FEED, since oats are a type of animal feed.