Headline band covering upcoming album (6)
I believe the answer is:
splash
'headline' is the definition.
(I've seen this before)
'band covering upcoming album' is the wordplay.
'band' becomes 'sash' (a band of material).
'covering' is an insertion indicator.
'upcoming' is a reversal indicator (in a down clue coming up is backwards).
'album' becomes 'LP' (abbreviation for a long-play record).
'lp' reversed gives 'pl'.
'sash' going around 'pl' is 'SPLASH'.
(Other definitions for splash that I've seen before include "sensation" , "big front page news" , "Prominent headline" , "Display (a story) prominently in a newspaper" , "Water raised by blow" .)