Tumbler drunk actor filled with Bass and drop of Armagnac (7)
I believe the answer is:
'tumbler' is the definition.
'drunk actor filled with bass and drop of armagnac' is the wordplay.
'drunk' is an anagram indicator.
'filled with' means one lot of letters goes inside another.
'bass' becomes 'b' (musical abbreviation).
'and' means one lot of letters go next to another.
'drop of' indicates taking the first letters.
The first letter of 'armagnac' is 'a'.
'actor' anagrammed gives 'croat'.
'croat' placed around 'b' is 'crobat'.
'crobat' after 'a' is 'ACROBAT'.
(Other definitions for acrobat that I've seen before include "Circus athlete", "Rope-dancer", "Gymnastic performer", "performer of risky feats?", "Athletic Circus Performer".)