Notable Elizabethan coin is found finally with garden tool (7,5)
I believe the answer is:
francis drake
'notable elizabethan' is the definition.
(Elizabethan explorer)
'coin is found finally with garden tool' is the wordplay.
'coin' becomes 'franc' (historical French coin).
'finally' indicates one should take the final letters.
'with' says to put letters next to each other.
'garden tool' becomes 'rake' (tool used when gardening).
The final letter of 'found' is 'd'.
'franc'+'is'+'d'+'rake'='FRANCIS DRAKE'
(Another definition for francis drake that I've seen is " Buccaneer".)