Some decide alternative content is most suitable (5)
I believe the answer is:
ideal
'most suitable' is the definition.
(I've seen this before)
'some decide alternative content' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'IDEAL' is hidden in the letters of 'decide alternative content'.
'is' acts as a link.
(Other definitions for ideal that I've seen before include "faultless" , "Consummate" , "existing only in imagination" , "Perfect but perhaps unlikely to become reality" , "Quite perfect, can't be improved on" .)