Second selection leads to row (5)
I believe the answer is:
scull
'row' is the definition.
(sculling is a kind of rowing)
'second selection' is the wordplay.
'second' becomes 's' (common abbreviation).
'selection' becomes 'cull' (cull can mean to pick or select).
's'+'cull'='SCULL'
'leads to' is the link.
(Other definitions for scull that I've seen before include "Row with two oars" , "Light rowing boat" , "Small oar" , "Blade" , "A single oar" .)