Coin found buried in ground, I'm excited! (4)
I believe the answer is:
dime
'coin' is the definition.
(I know that dime is a type of coin)
'buried in ground i'm excited' is the wordplay.
'buried in' indicates a hidden word.
'DIME' can be found hidden inside 'ground im excited'.
'found' acts as a link.
(Other definitions for dime that I've seen before include "Foreign coin" , "Small American coin" , "Ten US cents" , "10c coin" , "Ten-cent coin in America" .)