Start of rugby in old English clubs I found in study — it's compelling (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

{ 1st letter of ( Start of ) “ rugby ” contained in ( in ) [ O(abbrev. for “old”) + E(abbrev. for “English”) + C(abbrev. for “clubs”, the playing cards suit) + I ] } contained in ( found in ) CON(to study/learn).