Thanks for order in part of pub (7)
I believe the answer is:
taproom
'part of pub' is the definition.
('taproom' is part of 'pub')
'thanks for order' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'for' becomes 'pro' (I've seen this before).
'order' becomes 'om' (order of merit).
'ta'+'pro'+'om'='TAPROOM'
'in' acts as a link.
(Other definitions for taproom that I've seen before include "part of pub" , "Public bar" , "Source of beer" , "Type of bar" , "Hotel bar" .)