Millions associated with top-level club (4)
I believe the answer is:
mace
'level club' is the definition.
'mace' can be an answer for 'club' (mace can mean a club or stick). I'm not sure about the 'level' bit.
'millions associated with top' is the wordplay.
'millions' becomes 'm' (abbreviation).
'associated with' means one lot of letters go next to another.
'top' becomes 'ace' ().
'm'+'ace'='MACE'
Can you help me to learn more?
(Other definitions for mace that I've seen before include "Spice; heavy club" , "Spiked club" , "Staff - ground nutmeg" , "Medieval weapon or kind of spice" , "One of 9 [CLUBS]" .)