Possible Clues:

• Extremely quickly
• Rapid playing is to impress
• Letter in Greek receiving support is followed by second very quickly
• Girl I reared in English city, not entirely at breakneck speed
• Good teacher reflected about holiday, over extremely quickly
• In very quick tempo
• In a very quick tempo; music
• It's very quickly added to the score
• Shelter I fail to find, reversing in river at great speed