Small group welcoming learner, naturally bright (6)
I believe the answer is:
sunlit
'naturally bright' is the definition.
'sunlit' can be an answer for 'bright' ('sunlit' can be similar in meaning to 'bright'). I am not sure about the 'naturally' bit.
'small group welcoming learner' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'group' becomes 'unit' (unit is a kind of group**).
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'learner' becomes 'l'.
'unit' placed around 'l' is 'unlit'.
's'+'unlit'='SUNLIT'
Can you help me to learn more?
(Other definitions for sunlit that I've seen before include "Hit by solar rays" , "Illuminated from 93,000,000 miles away" , "Bathed in natural light" , "Bright with solar illumination" , "Not so at night" .)