Learner driver's introduced to unfamiliar choke (8)
I believe the answer is:
strangle
'choke' is the definition.
(thesaurus)
'learner driver's introduced to unfamiliar' is the wordplay.
'learner driver' becomes 'l' (I've seen this in other clues).
'introduced to' means one lot of letters goes inside another.
'unfamiliar' becomes 'strange' ('strange' can be similar in meaning to 'unfamiliar').
'l' placed into 'strange' is 'STRANGLE'.
(Other definitions for strangle that I've seen before include "Smother" , "Suppress (an impulse)" , "Kill by throttling" , "cut off supply of air" , "Kill by squeezing the throat" .)