That is to say a way to move a broken-down car? (2,3)
I believe the answer is:
to wit
'that is' is the definition.
('to wit' can mean 'namely' or 'that is')
'to say a way to move a broken-down car?' is the wordplay.
I cannot quite understand how this works, but
'to' is found in the answer.
'way' could be 'w' (Compass direction - West) and 'w' is located in the answer.
'car?' could be 't' and 't' is present in the answer.
A single letter 'i' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for to wit that I've seen before include "Namely" , "i.e." , "In other words" , "That is to say" , "specifically" .)