Group for the clever chaps observed losing weight (5)
I believe the answer is:
mensa
'group for the clever' is the definition.
I can't judge whether this definition defines the answer.
'chaps observed losing weight' is the wordplay.
'chaps' becomes 'men' (I've seen this before).
'observed' becomes 'saw' (I've seen this before).
'losing' is a deletion indicator.
'weight' becomes 'w'.
'saw' with 'w' taken out is 'sa'.
'men'+'sa'='MENSA'
Can you help me to learn more?
(Other definitions for mensa that I've seen before include "High IQ society" , "High-IQ society" , "High IQ_organisation" , "Organisation for people with high IQ" , "Organisation for the clever" .)