Possible Clues:

• Dramatic aid must be more punctual
• He puts a word in when required - which is quicker
• More punctual from the wings with a cue
• He'll help with the drying up
• One feeding the actors earlier
• One helping actors with lines
• ''Tele'' attachment
• Concertgoer with part for Mass who may intervene in a performer's part
• Punctual queen is found in 5 down...
• Linesman who is ready to help a player