upcast and carrying an instrument, said hello (7)
I believe the answer is:
Here is my best explanation:
'upcast and' is the definition.
I can't judge whether this defines the answer.
'carrying an instrument said hello' is the wordplay.
'carrying' indicates putting letters inside.
'an instrument' becomes 'lute' (lute is a kind of instrument).
'said hello' becomes 'sad' (I can't justify this - if you can you should give a lot more credence to this answer).
'lute' put inside 'sad' is 'SALUTED'.
(Other definitions for saluted that I've seen before include "Presented arms", "Greeted or honoured", "Recognised with a gesture", "Due last (anag.)", "Kissed", "Given a tribute" and "Acknowledged".)