Building a dining room, returning with tips from bricklayers last year (8)
I believe the answer is:
assembly
'building' is the definition.
(I know that assembly is a type of building)
'a dining room returning with tips from bricklayers last year' is the wordplay.
'dining room' becomes 'mess' (mess is a kind of dining room).
'returning' shows that the letters should be reversed in order.
'with' says to put letters next to each other.
'tips from' indicates taking the first letters.
The initial letters of 'bricklayers last year' is 'bly'.
'mess' reversed gives 'ssem'.
'a'+'ssem'+'bly'='ASSEMBLY'
(Other definitions for assembly that I've seen before include "Meeting; fabrication" , "Body of people that meets" , "Gathering of people for a common purpose" , "School morning gathering" , "Gathering, congretation 98)" .)