More suitable; preferable (6)
I believe the answer is:
better
I believe this is a double definition.
'more suitable' is the first definition.
'preferable' is the second definition.
(I've seen this in another clue)
(Other definitions for better that I've seen before include "Comparatively good" , "Top" , "Recovered; gambler" , "Gambler; cured" , "More competent - gambler" .)