Keep talking pluckily? (4)

I believe the answer is:

harp

I'm a little stuck... Click here to teach me more about this clue!

'keep' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for harp that I've seen before include "Lyre" , "Heavenly instrument?" , "Chordophone" , "''The ... that once through Tara's halls'' (4)" , "Emblem of Ireland" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.