'Enry's dropped it! (5)

I believe the answer is:

aitch

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

'it' is the definition.
The definition suggests a singular noun which matches the answer.

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

Can you help me to learn more?

(Other definitions for aitch that I've seen before include "character leading heroes" , "8th letter of the alphabet" , "It's dropped by Cockneys" , "Aspirated letter" , "the start of hives?" .)

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.