Prong (4)
'prong' is the definition.
(I know that tine is a type of prong)
This is the entire clue.
(Other definitions for tine that I've seen before include "(Fork's) prong" , "Spike" , "Slender prong of fork" .)
'prong' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for spike that I've seen before include "Anglo-Catholic comedian" , "Decide not to run" , "Large nail; thwart" , "Sharp point; flower cluster" , "Metal point" .)