Rejected injection around November with outsize instruments (6)

I believe the answer is:

banjos

I'm a little stuck... Click here to teach me more about this clue!

'instruments' is the definition.
(I have seen 'Stringed instruments ' mean 'banjos' so perhaps 'instruments' could also mean 'banjos')

'rejected injection around november with outsize' is the wordplay.
'rejected' is a reversal indicator.
'injection' becomes 'jab' (I've seen this before).
'around' indicates putting letters inside.
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'with outsize' becomes 'os' (I am not sure about the 'with' bit.).
'jab' going around 'n' is 'jnab'.
'jnab' in reverse letter order is 'banj'.
'banj'+'os'='BANJOS'

Can you help me to learn more?

(Another definition for banjos that I've seen is " Stringed instruments".)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app