Meaning of SUPPORTING in English
[adjective] [before noun; not gradable] - (in entertainment) not the most importantShe had a small supporting part/role in the play.He has twice won an Oscar for best supporting actor.(UK) A short supporting film was shown in advance of the main feature.(UK) The main film starts at 2.30 p.m., but there's a supporting programme which starts at 1.45 p.m.They first performed as a supporting act (US usually opening act) to a leading band five years ago.
Cambridge English vocab. Кембриджский английский словарь. 2012