Neutral vote you recorded in a mark of approval (7)
I believe the answer is:
asexual
'neutral' is the definition.
(thesaurus)
'vote you recorded in a mark of approval' is the wordplay.
'vote' becomes 'x' (how votes are marked).
'you' becomes 'u' (commonly used in online communication).
'recorded in' indicates putting letters inside.
'mark of approval' becomes 'seal' (I've seen this in another clue).
'x'+'u'='xu'
'a'+'seal'='aseal'
'xu' inserted within 'aseal' is 'ASEXUAL'.
(Other definitions for asexual that I've seen before include "Lacking in lust" , "Type of reproduction" , "Without functioning organs of reproduction" , "Spurning Congress" , "Neither male nor female" .)