Is this orange tree worth saving?
We recently bought a house in San Diego and this orange tree is in the backyard. I know it used to produce quite a few oranges from the neighbors.
As the pictures show, its leaves have completely fallen off and the only remaining yellow leaves appear to be from what appears to be a well-established sucker branch. Like most of the soil around here, it's planted in clay-like soil and has been pretty neglected for at least a few months (but it has looked the same since early October). If it's worth saving, I am eager to do so. If it's not, though, I would rather not spend the energy doing so.
Any advice would be most appreciated. Also, if it's worth saving, I'm eager to hear what you think could save it.
Here's a picture of the entire tree:
Most of the bark is cracking:
Closer view of the sucker branch leaves:
Thanks in advance for your help!