Short blast on first horn made from bone-like structure (5)
I believe the answer is:
tooth
'structure' is the definition.
(I know that tooth is a type of structure)
'short blast on first horn' is the wordplay.
'short blast' becomes 'toot' (I've seen this in another clue).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'first horn' becomes 'h' (1st letter of 'horn').
'toot'+'h'='TOOTH'
'made from bone-like' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for tooth that I've seen before include "Incisor, e.g." , "Bonelike structure" , "Let it stand" , "Canine, for example" , "Projection of a gear wheel" .)