Club perhaps losing several seconds costs series (7)
I believe the answer is:
coterie
This might be a double definition.
'club perhaps losing several seconds' is the first definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'costs series' is the second definition.
The answer and definition can be both groups as well as being singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for coterie that I've seen before include "Group, band" , "Small exclusive group of friends" , "Exclusive social circle" , "In-group" , "Set" .)