Old PM takes issue about bent bugle? (4-4)

'bent bugle?' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'old pm takes issue about' is the wordplay.
'old pm' becomes 'hawke' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'takes' indicates putting letters inside.
'issue' becomes 'son' (issue can mean someone's offspring).
'about' says the letters should be written backwards.
'son' back-to-front is 'nos'.
'hawke' placed around 'nos' is 'HAWK-NOSE'.

Can you help me to learn more?