Steve, for instance, said to be upset about Victor (5)
I believe the answer is:
davis
'steve for instance' is the definition.
I can't judge whether this definition defines the answer.
'said to be upset about victor' is the wordplay.
'to be upset' indicates anagramming the letters (I've seen 'are upset' mean this).
'about' means one lot of letters goes inside another.
'victor' becomes 'V' (phonetic alphabet: alpha, bravo, charlie etc.).
'said' with letters rearranged gives 'dais'.
'dais' enclosing 'v' is 'DAVIS'.
Can you help me to learn more?
(Other definitions for davis that I've seen before include "Miles, perhaps" , "Bette --; Miles --" .)