Nowadays you are behind oddball UK band (4)
I believe the answer is:
blur
'band' is the definition.
(English band)
'nowadays you are behind' is the wordplay.
'nowadays' becomes 'bl' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'you are' becomes 'ur' (text or internet abbreviation).
'behind' is a charade indicator (letters next to each other).
'bl'+'ur'='BLUR'
'oddball uk' acts as a 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?
(Other definitions for blur that I've seen before include "Make or become indistinct" , "Hazy or indistinct representation" , "Group - thing not clearly seen" , "Pop group; make unclear" , "Group - smudge" .)