Tell them first person is to bring up two-wheeled carriage (6)
I believe the answer is:
impart
'tell' is the definition.
(imparting is a kind of telling)
'them first person is to bring up two-wheeled carriage' is the wordplay.
I cannot quite see how this works, but
'first' could be 'i' (I in Roman numerals eg Elizabeth I) and 'i' is found in the answer.
'person' could be 'mp' (MP is an example) and 'mp' is located in the answer.
The remaining letters 'art' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for impart that I've seen before include "Give - relate" , "Reveal about armpit" , "offer" , "17 down (anag)" , "Give - tell" .)