Some characters of greater interest for poetic Ireland (4)
I believe the answer is:
erin
'poetic ireland' is the definition.
(I've seen this before)
'some characters of greater interest for' is the wordplay.
'some characters of' indicates the answer is hidden within the clue (some letters or characters from the clue).
'ERIN' can be found hidden inside 'greater interest for'.
(Other definitions for erin that I've seen before include "Old Ireland" , "Land" , "Romantic, archaic name for Ireland" , "Early and poetic name here" , "'Come back to ...' (emigrant song)" .)