Like certain pressure one thus accepts round pub (8)
I believe the answer is:
isobaric
'like certain pressure one thus accepts round pub' is the definition.
I can't tell whether this defines the answer.
'one thus accepts round pub' is the wordplay.
'one' becomes 'i' (Roman numeral).
'thus' becomes 'sic' ('thus' in Latin).
'accepts' is an insertion indicator.
'round' becomes 'o' (o is a circular letter).
'pub' becomes 'bar' (both are drinking establishments).
'o'+'bar'='obar'
'sic' placed around 'obar' is 'sobaric'.
'i'+'sobaric'='ISOBARIC'
Can you help me to learn more?
(Another definition for isobaric that I've seen is " of atmospheric contours".)