Second best for the most part, rugby player is getting in a row (4-2-4)
I believe the answer is:
back-to-back
'getting in a row' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'second best for the most part rugby player' is the wordplay.
'second' becomes 'back' (to second a motion is to back it).
'best' becomes 'top' (top can mean the very best).
'for the most part' means to remove the last letter (most but not all of the letters).
'rugby player' becomes 'back' (type of rugby player).
'top' with its last letter taken away is 'to'.
'back'+'to'+'back'='BACK-TO-BACK'
'is' is the link.
Can you help me to learn more?
(Another definition for back-to-back that I've seen is " Consecutive (informal)".)