Boozer holding price after rise gets boost (4,2)
I believe the answer is:
beef up
'boost' is the definition.
(beef up can mean to boost or make stronger)
'boozer holding price after rise' is the wordplay.
'boozer' becomes 'pub' (UK slang).
'holding' is an insertion indicator.
'price' becomes 'fee' (price paid for a service).
'after rise' shows that the letters should be reversed in order (in a down clue, letters go up).
'pub' placed around 'fee' is 'pufeeb'.
'pufeeb' back-to-front is 'BEEF UP'.
'gets' acts as a link.
(Other definitions for beef up that I've seen before include "Give added strength" , "Reinforce (colloq.)" , "Strengthen with cow meat?" , "buttress" , "message poor meat-eaters won't want to hear?" .)