Reportedly become aware of American count (6)
I believe the answer is:
census
'count' is the definition.
(I know that census is a kind of count)
'reportedly become aware of american' is the wordplay.
I cannot quite see how this works, but
'american' could be 'us' (United States) and 'us' is present in the answer.
The remaining letters 'cens' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for census that I've seen before include "Official body count?" , "Periodical population count" , "Periodic count as of population" , "Periodic count by statisticians" , "Head-count" .)