Judged to be oddly steady after crowds losing head (8)
I believe the answer is:
assessed
'judged' is the definition.
(assessing is a kind of judging)
'oddly steady after crowds losing head' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'after' is a charade indicator (letters next to each other).
'crowds' becomes 'masses' (masses of people).
'losing head' means to remove the first letter.
The alternating letters of 'steady' are 'sed'.
'masses' with its first letter taken away is 'asses'.
'sed' put after 'asses' is 'ASSESSED'.
'to be' is the link.
(Other definitions for assessed that I've seen before include "reviewed" , "checked out?" , "Evaluated" , "Appraised" , "Judged the worth of something" .)