Crossword Genius

A Ford not going on return trips (2,3,3)

Ross

I believe the answer is:

to and fro

I'm a little stuck... Click here to teach me more about this clue!

'a ford not going on return trips' is the definition.
I can't judge whether this definition defines the answer.

'a ford' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
an anagram of 'ford' is 'odfr' which is present in the remaining letters.
The remaining letters 'to' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for to and fro that I've seen before include "both ways" , "Shuttle's motion" , "From place to place" , "Back and forth like pendulum (2.3.3)" , "This way and that, back and forth" .)

I've seen this clue in The Globe and Mail.
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