Info about concerning colour (5)
I believe the answer is:
green
'colour' is the definition.
(I know that Green is a type of colour)
'info about concerning' is the wordplay.
'info' becomes 'gen' (informal term for information).
'about' is an insertion indicator.
'concerning' becomes 're' (both can mean on a particular topic).
'gen' going around 're' is 'GREEN'.
(Other definitions for green that I've seen before include "Putting area" , "It's for putting on - colour - inexperienced" , "Environmentally concerned" , "Genre (anag.)" , "Fresh - environmentally friendly - colour" .)