Player obsessed with technique knocked back whole band (4)
I believe the answer is:
muso
'player' is the definition.
(informal term for a musician)
'back whole band' is the wordplay.
'back' shows that the letters should be reversed in order.
'whole' becomes 'sum' (sum is a kind of whole).
'band' becomes 'o' (I've seen this in other clues).
'sum' in reverse letter order is 'mus'.
'mus'+'o'='MUSO'
'obsessed with technique knocked' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Another definition for muso that I've seen is " Keen auditor".)