Survey men wearing particular type of hat (8)
I believe the answer is:
panorama
'survey' is the definition.
(I've seen this before)
'men wearing particular type of hat' is the wordplay.
I cannot quite understand how this works, but
'men' could be 'or' (military abbreviation for Other Ranks) and 'or' is located in the answer.
'hat' could be 'panama' (panama is a kind of hat) and 'panama' is found within the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for panorama that I've seen before include "Wide view of region" , "long-running programme" , "'Vista, view (8)'" , "Extensive all-round view" , "Wide unbroken view" .)