Vocalist crooned with head down amid grand cheers (7)

'vocalist' is the definition.
(performer of gangsta rap)

'down amid grand cheers' is the wordplay.
'down' becomes 'angs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'amid' indicates putting letters inside.
'grand' becomes 'g' (G is short for grand as in a thousand).
'cheers' becomes 'ta' (both can mean thank you).
'g'+'ta'='gta'
'angs' going inside 'gta' is 'GANGSTA'.

'crooned with head' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?