Edges of Estonian flag intact (6)
I believe the answer is:
entire
'intact' is the definition.
('entire' can be a synonym of 'intact')
'edges of estonian flag' is the wordplay.
'edges of' means to remove the middle letters.
'flag' becomes 'tire' (I've seen this in other clues).
'estonian' with its middle taken out is 'en'.
'en'+'tire'='ENTIRE'
(Other definitions for entire that I've seen before include "in one piece" , "Whole - undamaged" , "Lure" , "Utter" , "Full and complete" .)