Enticing everyone to join university band (8)
I believe the answer is:
alluring
'enticing' is the definition.
(synonyms)
'everyone to join university band' is the wordplay.
'everyone' becomes 'all' (all people).
'to join' is a charade indicator (letters next to each other).
'university' becomes 'U' (abbreviation as in UMass).
'band' becomes 'ring' (a ring is a band of metal).
'all'+'u'+'ring'='ALLURING'
(Other definitions for alluring that I've seen before include "Fascinating, attractive" , "Enticing" , "Seductive" , "Powerfully attractive" .)