A worn nutcracker, I see (5)
I believe the answer is:
tunic
'a worn' is the definition.
I can't tell whether this definition defines the answer.
'nutcracker i see' is the wordplay.
'nutcracker' becomes 'tun' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'see' becomes 'C' (the word for the letter, according to Chambers).
'tun'+'i'+'c'='TUNIC'
Can you help me to learn more?
(Other definitions for tunic that I've seen before include "Belted coat" , "(Policeman's) jacket" , "Upper garment, for a soldier say" , "Jacket of some soldiers" , "Loose sleeveless garment" .)