Mixture showing some charisma, glam albeit retro (7)
I believe the answer is:
amalgam
'mixture' is the definition.
(amalgam is a kind of mixture)
'some charisma glam albeit retro' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'retro' says the letters should be written backwards (retro is Latin for 'backwards').
'maglama' is hidden in the letters of 'charisma glam albeit'.
'maglama' reversed gives 'AMALGAM'.
'showing' is the link.
(Other definitions for amalgam that I've seen before include "combination of things" , "Ring-bearing hobbit" , "Mixture (for dental fillings)" , "often filling" , "mercurial combination" .)