Cryptic crossword clue
Unusually spine’s erect showing determination 11

The most common and most likely answer to this crossword clue is the 11 letter word PERSISTENCE

I've seen this crossword clue in The Daily Telegraph
P
E
R
S
I
S
T
E
N
C
E

Buddy explains!

The straight part
We know that "determination" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case determination = persistence.
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 PERSISTENCE mean?

PERSISTENCE noun
  1. The property of being persistent.
  2. Of data, the property of continuing to exist after the termination of the program.
  3. Continuation of the previous day's weather (particularly temperature and precipitation statistics).

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