Draw and turn gun on US military HQ (8)
I believe the answer is:
pentagon
'us military hq' is the definition.
(I've seen this before)
'draw and turn gun on' is the wordplay.
'draw' becomes 'pen' (I can't explain this - if you can you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'turn' is a reversal indicator.
'gun' becomes 'gat' (US informal term for a gun).
'gat' in reverse letter order is 'tag'.
'pen'+'tag'+'on'='PENTAGON'
Can you help me to learn more?
(Other definitions for pentagon that I've seen before include "Figure in plane" , "US building of high security" , "US government building" , "Five-sided shape" , "Headquarters of the US Defence Department" .)