Blow your own horn in the third tier? (4)
I believe the answer is:
crow
'blow' is the definition.
(thesaurus)
'your own horn in the third tier?' is the wordplay.
I cannot quite understand how this works, but
'tier?' could be 'row' (eg a row of seats at a theatre) and 'row' is located in the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for crow that I've seen before include "Large black bird" , "Make sound of cock - bird" , "Gloat" , "Ugly old woman" , "Boast gloatingly, American Indian" .)