Customs that suit many a horseman (6,6)
I believe the answer is:
riding habits
'suit many a horseman' is the definition.
I can't tell whether this definition defines the answer.
'customs' is the wordplay.
I cannot really understand how this works, but
'customs' could be 'habits' (habit is a kind of custom) and 'habits' is found within the answer.
The remaining letters 'riding' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'that' is the link.
Can you help me to learn more?
(Another definition for riding habits that I've seen is " suit the mounted".)