The most common and most likely answer to this crossword clue is the 10 letter word OPTIMISTIC
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result OPTIMISTIC
- Hopeful fellow is taken in by viewer
- Hopeful boy is getting into drink dispenser
- Upbeat Farron is into a fair measure of spirits
- Upbeat current film has visual restraint
- Bullish little man is twitching after work
- Upbeat engineer: I’m stoic about pit renovation
- Pythonesque topic about film, independent looking on the bright side of life
- Hopeful, I’m first to break attachment to bottle
- Cheerful and confident I am first to enter measuring device
- Choose one spiritualist, say, seeing bright future
Buddy explains!

The straight part
We know that "seeing bright future" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case seeing bright future = optimistic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does OPTIMISTIC mean?
OPTIMISTIC adjective- Expecting the best in all possible ways.
- Allowing other processes to perform transactions on the same data at the same time, and checking for conflicts only when changes need to be written back.