Thanks Swarbrules. I've put in an answer. Still no idea what 'habits' is doing in the clue, though.
As for 16a ... It strikes me as one of those clues that the setter dreams up and then congratulates himself without ever thinking how utterly impossible it is to work out on its own merits (i.e. without crossers ... and, in my case, some help with parsing from this forum).
Everymans have become wildly inconsistent of late, varying from the likes of this (as tough as a Paul Prize imo) one week to virtual write-ins the next. As you suggest, he's not really fulfilling the brief.