A couple of new drivers will get the lot (3)
I believe the answer is:
all
'the lot' is the definition.
(I've seen this before)
'a couple of new drivers' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'new drivers' could be 'll' (the abbreviation for learner driver written twice) and 'll' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'will get' acts as a link.
Can you help me to learn more?
(Other definitions for all that I've seen before include "100%" , "nothing more" , "The whole quantity" , "'Bless 'em - - ' (song)" , "Long avenue or garden path" .)