Hi again jerry - I've found the puzzle & for others that might be interested, the clue is -
13a Puck etc, in this sense accepting his master's opening couplet (4)
Hobs - Chambers gives 'hob' as "Robin Goodfellow" (Puck, from "A Midsummer Night's Dream") - 'Ob(eron)' (opening 2 letters of Puck's master) (in) 'hs' (hoc sensu; Latin "in this sense")