15a. Safety first leaving insect, having to put it back in the water (5) R?D?P. I think the answer is REDIP. An anagrm of 'spider' minus the s from safety. However a spider is not an insect! Any thoughts or explanations gratefully received. Many thanks.
Not very good clue I admit. You are right that a spider is not a member of the class Insecta but in common usage an insect can mean 'any small arthropod, such as a spider, tick, or centipede, having a superficial, general similarity to the insects"