Small vegetable not at all rough (5)
I believe the answer is:
sleek
'not at all rough' is the definition.
I can't judge whether this definition defines the answer.
'small vegetable' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'vegetable' becomes 'leek' (leek is a kind of vegetable).
's'+'leek'='SLEEK'
Can you help me to learn more?
(Other definitions for sleek that I've seen before include "Aerodynamic - well-groomed" , "With a smooth, gleaming surface" , "Glossy and well fed" , "Smooth and shiny" , "(Of hair) smooth, glossy" .)