Possible Clues:

• Timely, or a phonetic hint to how 16-, 26- and 47-Across turn
• Timely expression of support given with letter read out
• As if orchestrated
• Where you might put the chalk in the snooker club for the perfect moment
• Pat's blue uniform fitted in previously
• At the perfect moment
• Prompt ... or a hint to entering five answers in this puzzle
• At the correct time