Get a short teetotaller in a muddle (6)
I believe the answer is:
attain
'get' is the definition.
(I know that attain is a more specific form of the action get)
'a short teetotaller in a muddle' is the wordplay.
'short teetotaller' becomes 'tt' (abbreviation; 'short' asks for an abbreviation).
'muddle' indicates an anagram.
'in'+'a'='ina'
'ina' anagrammed gives 'ain'.
'a'+'tt'+'ain'='ATTAIN'
(Other definitions for attain that I've seen before include "Bring off" , "Reach (a specified age)" , "Reach (a particular age)" , "Reach with effort" , "Reach or accomplish" .)