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 "First, earliest", "Existing from the start - quite new", "Not a copy", "Archetype,master copy", "New in character or design - not a copy", "An oil rig (anag)", "Archetypal", "Archetype, master copy", "Never seen or performed before" and "Not derived or copied form something else".)