Racy cadets worried faint-hearted person (10)
I believe the answer is:
scaredycat
'faint-hearted person' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'racy cadets worried' is the wordplay.
'worried' indicates anagramming the letters (worry can mean to interfere with or disturb).
'racy'+'cadets'='racycadets'
'racycadets' anagrammed gives 'SCAREDYCAT'.
Can you help me to learn more?
(Another definition for scaredycat that I've seen is " Chicken".)