Second copper seen with learners using oar (5)
I believe the answer is:
scull
'oar' is the definition.
(scull is a kind of oar)
'second copper seen with learners' is the wordplay.
'second' becomes 's' (common abbreviation).
'copper' becomes 'Cu' (Cu is the chemical symbol for copper).
'seen with' means one lot of letters go next to another.
'learners' becomes 'LL' (the abbreviation for learner driver written twice).
's'+'cu'+'ll'='SCULL'
'using' is the link.
(Other definitions for scull that I've seen before include "Small oar" , "Row with two oars" , "A single oar" , "racing shell" , "Blade" .)