Non-native regularly seen in Dáil Éireann (5)
I believe the answer is:
alien
'non-native' is the definition.
(I've seen this in another clue)
'regularly seen in dail eireann' is the wordplay.
'regularly seen in' means one should take alternating letters.
'dail'+'eireann'='daileireann'
The alternate letters of 'daileireann' are 'ALIEN'.
(Other definitions for alien that I've seen before include "24a [ESTRANGE]" , "One is from outer space, perhaps" , "Little green man, perhaps" , "Foreign; extraterrestrial" , "exciting film based in space" .)