Crossword Genius

Instrument a bighead stuck together with glue (5)

Ross

I believe the answer is:

bugle

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

'instrument' is the definition.
(I know that bugle is a type of wind)

'a bighead stuck together with glue' is the wordplay.
I cannot really understand how this works, but
'bighead' could be 'b' (the head letter of 'big') and 'b' is present in the answer.
an anagram of 'glue' is 'ugle' which is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for bugle that I've seen before include "Brass instrument; plant" , "'Last Post' instrument" , "Brass instrument without valves" , "An army trumpet" , "one may have blown it!" .)

I've seen this clue in the Evening Standard.
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