13a Natural sweetener with monofloral varieties derived from the nectar of manuka, orange blossom, wild thyme, rosemary, lavender or clover flowers [5]
15a Sheet bend, clove hitch, bowline, round turn - general word for the fastenings described in the camping skills section of Boy Scouts Handbook [4]
37a - criers, principal means of news communication in Medieval England [4]