Conspicuous standard has to rave (8)
I believe the answer is:
flagrant
'conspicuous' is the definition.
(I've seen this before)
'standard has to rave' is the wordplay.
'standard' becomes 'flag' (standard is a type of flag).
'has' says to put letters next to each other.
'to rave' becomes 'rant' (synonyms).
'flag'+'rant'='FLAGRANT'
(Other definitions for flagrant that I've seen before include "Being shameless" , "Conspicuous, blatant" , "Barefaced" , "Patent" , "Crying" .)