Promos for covers of rubbish Britpop band put first (6)
I believe the answer is:
blurbs
'promos for covers' is the definition.
(promotional text for book covers)
'britpop band put first' is the wordplay.
'britpop' becomes 'bs' (I am not sure about this - if you are sure you should believe this answer much more).
'band' becomes 'blur' (English band).
'put first' means one lot of letters go next to another.
'bs' put after 'blur' is 'BLURBS'.
'of rubbish' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Another definition for blurbs that I've seen is " Descriptions in advertising matter in praise of products".)