Bolted after the horse - it's too late (6,4)
I believe the answer is:
stable door
'bolted after' is the definition.
I can't judge whether this defines the answer.
'the horse it's too late' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'late' could be 'd' and 'd' is located in the answer.
'it' could be 'sa' (old-fashioned abbreviation for sex appeal) and 'sa' is found within the remaining letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for stable door that I've seen is " It's often locked after the horse has bolted".)