Charity raising some awareness e.g. rallying (8)
I believe the answer is:
largesse
'charity' is the definition.
(thesaurus)
'raising some awareness e g rallying' is the wordplay.
'raising' is a reversal indicator.
'some' indicates a hidden word (some of the parts of the word are used).
'essegral' is hidden in the letters of 'awareness e g rallying'.
'essegral' in reverse letter order is 'LARGESSE'.
(Other definitions for largesse that I've seen before include "Generous disposal of gifts" , "Generous offering" , "Generosity in gift-giving" , "Generous alms" , "Magnanimous bestowal of gifts" .)