Hang loose like dunderhead on corner (6)
I believe the answer is:
dangle
'hang loose' is the definition.
'dangle' can be an answer for 'hang' (dangling is a kind of hanging). I am not certain of the 'loose' bit.
'dunderhead on corner' is the wordplay.
'dunderhead' becomes 'd' (head letter of 'dunder').
'on' says to put letters next to each other (in a down clue, letters appear on others).
'corner' becomes 'angle' (eg a corner of a shape).
'd'+'angle'='DANGLE'
'like' acts as a link.
Can you help me to learn more?
(Other definitions for dangle that I've seen before include "Temptingly offer" , "Hang provocatively" , "Hang loosely or swing" , "Hang so as to swing freely" , "Suspend in front of Glenda" .)