She blows a horn like Peter after the first Bacardi (9)
I believe the answer is:
trumpeter
'she blows a horn' is the definition.
I can't judge whether this defines the answer.
'peter after the first bacardi' is the wordplay.
'after' means one lot of letters go next to another.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'first bacardi' becomes 'rum' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
't'+'rum'='trum'
'peter' put after 'trum' is 'TRUMPETER'.
'like' acts as a link.
Can you help me to learn more?
(Other definitions for trumpeter that I've seen before include "[SOMETHING FISHY]" , "kind of pigeon" , "Elephant perhaps" , "one of a band" , "sends out signals?" .)