So at that point the van was following (9)
I believe the answer is:
therefore
'so' is the definition.
(I've seen this before)
'at that point the van was following' is the wordplay.
I cannot quite see how this works, but
'at' could be 'her' (I've seen this in other clues) and 'her' is found in the answer.
'point' could be 'e' (E is an example) and 'e' is present in the answer.
'following' could be 'f' (used when citing page numbers etc) and 'f' is located in the answer.
The remaining letters 'tore' is a valid word 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 therefore that I've seen before include "It follows" , "Consequently - for that reason" , "as result" , "Thus" , "has a triangular formation in maths?" .)