First to get over splintered railing (8)
I believe the answer is:
Here is my best explanation:
'first' is the definition.
('original' can be similar in meaning to 'first')
'get over splintered railing' is the subsidiary indication.
'get' is a charade indicator (letters next to each other).
'over' becomes 'o' (cricket abbreviation**).
'splintered' indicates an anagram.
'railing' anagrammed gives 'riginal'.
'o'+'riginal' is 'original'.
'to' is the link.
(Other definitions for original that I've seen before include "From which a copy is made", "New in character or design - not a copy", "The first, not a copy", "Not derived or copied from anything else", "Innovative", "Archetypal", "derivation", "Native", "inspiration for fictional character" and "Master copy".)