Yikes these are splendid finals of Origin! (4)
I believe the answer is:
seed
'origin' is the definition.
(seed is a kind of origin)
'yikes these are splendid finals' is the wordplay.
'finals' says to take the final letters (the final letters).
The final letters of 'yikes these are splendid' are 'SEED'.
'of' acts as a link.
(Other definitions for seed that I've seen before include "Top competitor" , "Top Wimbledon player" , "Plant reproducer" , "See 19" , "Propagative part of plant" .)