Standard managed by teams leader is outrageous (8)
I believe the answer is:
flagrant
'outrageous' is the definition.
(I've seen this before)
'standard managed by teams leader' is the wordplay.
'standard' becomes 'flag' (I've seen this before).
'managed' becomes 'ran' (I've seen this before**).
'by' means one lot of letters go next to another.
'leader' suggests taking the first letters.
The first letter of 'teams' is 't'.
'flag'+'ran'+'t'='FLAGRANT'
'is' acts as a link.
(Other definitions for flagrant that I've seen before include "Of unconcealed outrageousness" , "Crying" , "Very bad and obvious, say offence" , "Patent" , "Conspicuous, blatant" .)