Row in Dublin estate (4)
I believe the answer is:
line
'row' is the definition.
(I've seen this before)
'in dublin estate' is the wordplay.
'in' indicates the answer is hidden within the clue.
'LINE' is hidden in the letters of 'dublin estate'.
(Other definitions for line that I've seen before include "Phone connection; queue" , "column" , "Dress" , "It's long relative to its width" , "Winter sports slope" .)