Discreetly, relatives bring up musical (5)
I believe the answer is:
evita
'musical' is the definition.
(Andrew Lloyd Webber musical)
'discreetly relatives bring up' is the wordplay.
'bring' says the answer is hidden in the clue (I've seen 'bringing' mean this).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'ative' is hidden in the letters of 'discreetly relatives'.
'ative' back-to-front is 'EVITA'.
(Other definitions for evita that I've seen before include "Eva Peron" , "Musical based on Argentine leader" , "Show" , "Stage musical" , "1996 musical film, starring Madonna" .)