Zig-zagging right in a trice, drunkenly (7)

I believe the answer is:

erratic

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'zig-zagging' is the definition.
I can't tell whether this defines the answer.

'right in a trice drunkenly' is the wordplay.
'right' becomes 'r' (common abbreviation).
'in' indicates putting letters inside.
'drunkenly' indicates an anagram.
'a'+'trice'='atrice'
'atrice' is an anagram of 'eratic'.
'r' inserted within 'eratic' is 'ERRATIC'.

Can you help me to learn more?

(Other definitions for erratic that I've seen before include "Irregular or uneven, not steady" , "Variable" , "Cartier (anag.)" , "Uneven in movement or quality" , "Wayward" .)

I've seen this clue in The Mirror.

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