Lobby to acquire vintage bag (7)
I believe the answer is:
holdall
'bag' is the definition.
(I know that holdall is a type of bag)
'lobby to acquire vintage' is the wordplay.
'lobby' becomes 'hall' (synonyms).
'to acquire' means one lot of letters goes inside another.
'vintage' becomes 'old' (I've seen this before).
'hall' enclosing 'old' is 'HOLDALL'.
(Other definitions for holdall that I've seen before include "A large soft travelling bag - stuff everything in" , "Large bag (no need for another?)" , "Largish bag" , "Large carrying bag" , "Large case, with handles" .)