One in conversation with neurotic learner driver panicking on hill (12)
I believe the answer is:
interlocutor
'one in conversation' is the definition.
'neurotic learner driver panicking on hill' is the wordplay.
'learner driver' becomes 'l' (I've seen this in other clues).
'panicking' indicates anagramming the letters.
'on' is a charade indicator (letters next to each other).
'hill' becomes 'tor' (tor is a kind of hill).
'neurotic'+'l'='neuroticl'
'neuroticl' anagrammed gives 'interlocu'.
'interlocu'+'tor'='INTERLOCUTOR'
'with' acts as a link.
(Another definition for interlocutor that I've seen is " Participant in a dialogue".)