Partner of Bill Paxton's opening a shop (2-2)
I believe the answer is:
co-op
'a shop' is the definition.
(thesaurus)
'partner of bill paxton's opening' is the wordplay.
'partner of bill' becomes 'coo' (I've seen this in another clue).
'opening' says to take the initial letters.
The first letter of 'paxton' is 'p'.
'coo'+'p'='CO-OP'
(Other definitions for co-op that I've seen before include "Enclosure for chickens" , "Hen-house" , "A cage for poultry" , "Fowl-run" , "Poultry pen" .)