Musical Term Meaning to be Performed with Increasing Speed

What’s the Musical term meaning to be performed with increasing speed? The mail on Sunday 7 May 2017 £1,500 prized crossword clue.

The answer is ACCELERANDO

The Italian musical command accelerando (often abbreviated accel.) is an indication to gradually increase the tempo of a song until otherwise noted:

The duration of an accelerando is marked by a dashed, horizontal line.
An accelerando with no dashed line may be terminated with commands such as tempo primo or tempo comodo.
ALSO KNOWN AS:
accélérez; en accélérant (Fr)
beschleunigend; schneller (Ger)