The most common and most likely answer to this crossword clue is the 14 letter word SELF-CONSCIOUS
S
E
L
F
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C
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Buddy explains!
The straight part
We know that "Shy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shy = self-conscious.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 SELF-CONSCIOUS mean?
SELF-CONSCIOUS adjective- Aware of oneself as an individual being.
- Uncomfortably over-conscious of one's appearance or behaviour.
- Socially ill at ease.