Measure of spirits and half of bitter — walk unsteadily? (6)
I believe the answer is:
Here is my best explanation:
'walk unsteadily?' is the definition.
(I've seen this before)
'measure of spirits and half of bitter' is the subsidiary indication.
'measure of spirits' becomes 'tot' (I've seen this before).
'and' is a charade indicator (letters next to each other).
'half of' means to take half the letters.
'bitter' becomes 'porter' (porter is a kind of bitter).
'porter' halved 'ter'.
(Other definitions for totter that I've seen before include "Be unsteady on one's feet", "Rag-and-bone man - summer", "Sway, as if about to fall", "Walk unsteadily - nearly fall", "Lurch", "Walk shakily as if about to fall", "Stagger, reel", "Scrap dealer", "Stand/walk unsteadily" and "Waver and threaten to fall".)