Bar's saving pounds in charge account for promotional activity (6,9)
I believe the answer is:
public relations
'promotional activity' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'bar's saving pounds in charge account for' is the wordplay.
'bar's' becomes 'pub's'.
'saving' indicates putting letters inside.
'pounds' becomes 'L' (abbreviation e.g. Lsd - pounds, shillings, pence).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'account for' becomes 'relation' (I can't explain this - if you can you should give a lot more credence to this answer).
'l'+'ic'+'relation'='licrelation'
'pubs' enclosing 'licrelation' is 'PUBLIC RELATIONS'.
Can you help me to learn more?
(Other definitions for public relations that I've seen before include "work for popular approval" , "Image-burnishing activity" , "promotion" , "Promotional department" .)