Ready for electric car to reverse with learner inside (6)

'ready' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'electric car to reverse with learner inside' is the wordplay.
'electric car' becomes 'tesla' (I've seen this in another clue).
'to reverse' says the letters should be written in reverse.
'with' means one lot of letters goes inside another.
'learner inside' becomes 'l' (I can't justify this - if you can you should give a lot more credence to this answer).
'tesla' back-to-front is 'alset'.
'alset' placed around 'l' is 'ALLSET'.

'for' acts as a link.

Can you help me to learn more?