Distance travelled in reverse, for example, by a cart (7)
I believe the answer is:
yardage
'distance travelled in' is the definition.
'yardage' can be an answer for 'distance' (I've seen this before). I'm unsure of the 'travelled in' bit.
'reverse for example by a cart' is the wordplay.
'reverse' shows that the letters should be reversed in order.
'for example' becomes 'eg' (synonyms).
'by' is a charade indicator (letters next to each other).
'cart' becomes 'dray' (a cart without sides for delivering heavy loads).
'eg'+'a'+'dray'='egadray'
'egadray' in reverse letter order is 'YARDAGE'.
Can you help me to learn more?
(Other definitions for yardage that I've seen before include "measure" , "Distance gained (Am. football)" , "Gay dear (anag.)" , "Golf or American Football statistic" , "Length in units of three feet" .)