Created especially for young girl in the old days, they said, following tradition (6-4)
I believe the answer is:
custom-made
'created' is the definition.
(thesaurus)
'said following tradition' is the wordplay.
'said' becomes 'made' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'following' says to put letters next to each other.
'tradition' becomes 'custom' (synonyms).
'made' put after 'custom' is 'CUSTOM-MADE'.
'especially for young girl in the old days they' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Another definition for custom-made that I've seen is " Built to order".)