Stick on audio equipment for contentious argument (7)
I believe the answer is:
polemic
'contentious argument' is the definition.
'polemic' can be an answer for 'argument' (polemic is a kind of argument). I am unsure of the 'contentious' bit.
'stick on audio equipment' is the wordplay.
'stick' becomes 'pole'.
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'audio equipment' becomes 'mic' (short for microphone).
'pole'+'mic'='POLEMIC'
'for' is the link.
Can you help me to learn more?
(Other definitions for polemic that I've seen before include "Strong verbal or written attack" , "tirade" , "Controversy, argument" , "Compile to make verbal attack on belief" , "Controversial speech or writing" .)