Share out is tried but as an alternative (10)
I believe the answer is:
distribute
'share out' is the definition.
(synonyms)
'is tried but as an alternative' is the wordplay.
'is tried but' can be anagrammed to 'DISTRIBUTE'.
Though, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for distribute that I've seen before include "Pass round" , "Deal out" , "spread" , "Give out" , "Supply" .)