Mocking learner after Day One — car breaks down around lunchtime (9)
I believe the answer is:
satirical
'mocking' is the definition.
(I've seen this before)
'learner after day one car breaks down around lunchtime' is the wordplay.
I cannot really understand how this works, but
'learner' could be 'l' and 'l' is present in the answer.
'day' could be 'sat' (abbreviation for Saturday) and 'sat' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'around' could be 'ca' (circa) and 'ca' is found in the answer.
'lunchtime' could be 'i' (1pm could be I on a clock with Roman numerals) and 'i' is found within the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
(Other definitions for satirical that I've seen before include "scornful" , "taunting?" , "Ridiculing" , "Ironic - sarcastic" , "Describing irreverent humour" .)