Guide for audience to put on face mask (7)
I believe the answer is:
advisor
'guide' is the definition.
(I've seen this before)
'for audience to put on face mask' is the wordplay.
'for audience' shows a homophone (sound like) (how it might sound to an audience).
'to put on' becomes 'add' (I've seen this in another clue).
'face mask' becomes 'visor' (mask for one's face).
'add' is a homophone of 'ad'.
'ad'+'visor'='ADVISOR'
(Other definitions for advisor that I've seen before include "One offers recommendations" , "Mentor, counsel" , "One giving counsel (O, not E)" , "Wise counsellor" , "Guide; VI roads (anag.)" .)