Quality expert forward added to rugby, finally (8)
I believe the answer is:
property
'quality' is the definition.
(thesaurus)
'expert forward added to rugby finally' is the wordplay.
'expert' becomes 'pro' (I've seen this before).
'forward' becomes 'pert' (I've seen this before**).
'added to' means one lot of letters go next to another.
'finally' indicates one should take the final letters.
The last letter of 'rugby' is 'y'.
'pro'+'pert'+'y'='PROPERTY'
(Other definitions for property that I've seen before include "Something owned" , "Stuff that is owned" , "Asset" , "Buildings" , "Quality; building" .)