Indicate tirade as outrageous (8)

I believe the answer is:

flagrant

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'outrageous' is the definition.
(flagrant can mean outrageous or blatant)

'indicate tirade' is the wordplay.
'indicate' becomes 'flag' (I can't explain this - if you can you should believe this answer much more).
'tirade' becomes 'rant' (both can mean an angry outburst).
'flag'+'rant'='FLAGRANT'

'as' acts as a link.

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(Other definitions for flagrant that I've seen before include "Blatant, outrageous" , "Unashamed" , "notorious" , "Patent" , "Crying" .)

I've seen this clue in The Sun.

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