Sarcasm from the club youth leader (5)
I believe the answer is:
irony
'sarcasm' is the definition.
(I know that sarcasm can be written as irony)
'the club youth leader' is the wordplay.
'the club' becomes 'iron' (type of golf club).
'youth leader' becomes 'y' (I've seen this in other clues).
'iron'+'y'='IRONY'
'from' acts as a link.
(Other definitions for irony that I've seen before include "Kind of sarcasm, sounds metallic" , "like a metallic element" , "Caustic remark" , "Scornful wit" , "Mild sarcasm" .)