Slender and small, not weighing much (6)
I believe the answer is:
slight
'not weighing much' is the definition.
I can't judge whether this defines the answer.
'slender and small' is the wordplay.
'slender' becomes 's' (this could be a standard abbreviation which I don't know about).
'and' means one lot of letters go next to another.
'small' becomes 'light'.
's'+'light'='SLIGHT'
Can you help me to learn more?
(Other definitions for slight that I've seen before include "Flimsy, tenuous" , "Minor - insult" , "Small in degree; insult" , "Redeemer" , "Minor -- snub" .)