Combined to form a single entity (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
merged
'combined to form a single entity' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for merged that I've seen before include "Got together" , "Coalesced" , "United or blended." , "Combined to form a single entity" , "Came together" .)