Deduced the grade must be reviewed (8)
I believe the answer is:
gathered
'reviewed' is the definition.
The answer and definition can be both related to thinking as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?
'deduced the grade must' is the wordplay.
'the grade' can be anagrammed to 'GATHERED'.
But, I'm not clear how this is indicated.
'be' acts as a link.
Can you help me to learn more?
(Other definitions for gathered that I've seen before include "Surmised" , "Picked up" , "Accumulated, brought together" , "The grade (anag.)" , "Drew" .)