Would it's last letter alone suffice? (5)
I believe the answer is:
aitch
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for aitch that I've seen before include "that may be dropped" , "It's dropped by Cockneys" , "bone" , "first bit of hymn?" , "character leading heroes" .)