Around tavernas essentially it's drunk neat regularly (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

ER ( central letters of [essentially] tav ER nas) reversed (around) + an anagram of (drunk) IT’S + NA (l etters 1 and 3 [regularly] of N e A t) – an &Lit clue where the whole clue is the definition