A squeaky-sounding “Hurry!” (3)

I believe the answer is:

hie

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

'hurry' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for hie that I've seen before include "Hurry" , "Make one's way quickly" , "Hasten" , "Go quickly (archaic)" , "make haste" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app