Old measure for association (6)
I believe the answer is:
league
This might be a double definition.
'old measure' is the first definition.
'league' can be an answer for 'measure' (league is a kind of measure). I am not certain of the 'old' bit.
'for association' is the second definition.
(league is a kind of association)
Can you help me to learn more?
(Other definitions for league that I've seen before include "Alliance - three (poetic) miles" , "Old units of distance" , "Combination of groups for a purpose, sports clubs perhaps" , "Union - measure" , "Association of sports teams to organise matches" .)