Describing pressure arising from wandering of erratic mob (10)

I believe the answer is:

barometric

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'describing pressure arising from wandering' is the definition.
I can't tell whether this definition defines the answer.

'of erratic mob' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'erratic'+'mob'='erraticmob'
'erraticmob' is an anagram of 'BAROMETRIC'.

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(Other definitions for barometric that I've seen before include "concerned with pressure in the air" , "Measuring atmospheric pressure" .)

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