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12 A. "on returning i give the go-ahead to fish"
3 letters ??i
20. A. "one has no right it that if the wrong occurs, it'll be right."
5 letters ?h?e?
possibly THIEF !
61 A. "might dressing for dinner cause distress ? "
5 letters ?A?C?
possibly SAUCE why

12a koi (I OK reversed)

Sauce is an anagram of cause (distress anagrind)?

thief is an anagram ("wrong") of "of the", so yes!