Charm? Some sentimentalism anyway (8)
I believe the answer is:
talisman
'charm?' is the definition.
('talisman' can be a synonym of 'charm')
'some sentimentalism anyway' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TALISMAN' can be found hidden inside 'sentimentalism anyway'.
(Other definitions for talisman that I've seen before include "Object bringing luck" , "Object believed to protect wearer" , "Charm thought to bring good luck" , "which is charming" , "Lucky charm" .)