Come forth from East and combine (6)
I believe the answer is:
emerge
'come forth' is the definition.
(synonyms)
'east and combine' is the wordplay.
'east' becomes 'e' (abbreviation).
'and' means one lot of letters go next to another.
'combine' becomes 'merge' (synonyms).
'e'+'merge'='EMERGE'
'from' is the link.
(Other definitions for emerge that I've seen before include "Come into view" , "Develop" , "Come into existence" , "Gradually come out" , "Issue" .)