Drivel entered into standard form by rote (6-7)
I believe the answer is:
parrot-fashion
'by rote' is the definition.
(I've seen this before)
'drivel entered into standard form' is the wordplay.
I cannot quite see how this works, but
'drivel' could be 'rot' (rot is a kind of drivel) and 'rot' is present in the answer.
'standard' could be 'par' (standard of play in golf) and 'par' is found within the answer.
'form' could be 'fashion' (I've seen this in another clue) and 'fashion' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for parrot-fashion that I've seen before include "(Learning) by rote" , "By rote (haute couture for birds?)" .)