Feature of Ireland's presidential seal (4)

I believe the answer is:

harp

(Other definitions for harp that I've seen before include "Talk tiresomely using upright musical instrument" , "''The ... that once through Tara's halls'' (4)" , "Musical symbol" , "Instrument (for angels?)" , "Chordophone" .)

I've seen this clue in The Wall Street Journal.

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