Club’s founder has single out: a slow burner! (8)
I believe the answer is:
pickwick
'club's founder has single' is the definition.
I can't judge whether this defines the answer.
'a slow burner' is the wordplay.
'a slow' becomes 'pick' (I am not sure about this - if you are sure you should believe this answer much more).
'burner' becomes 'wick' (I've seen this before).
'pick'+'wick'='PICKWICK'
'out' is the link.
Can you help me to learn more?
(Other definitions for pickwick that I've seen before include "club president" , "Hero of a Dickens novel" , "Jolly Dickensian hero" , "Dickensian (with papers)" , "Dickens character" .)