I agree twice to cross the road, horse having gone past (9)
I believe the answer is:
yesterday
'past' is the definition.
(in the past)
'i agree twice to cross the road horse having gone' is the wordplay.
I cannot really understand how this works, but
'i' could be 'a' and 'a' is located in the answer.
'cross' could be 't' (shape) and 't' is present in the answer.
'road' could be 'rd' (abbreviation) and 'rd' is found in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for yesterday that I've seen before include "of most recent history" , "Twenty-four hours ago" , "Classic song" , "1965 Beatles hit" , "short time ago" .)