Chamber group accepting bit of Ravel's over fifteen minutes short (7,2)
I believe the answer is:
quarter to
'fifteen minutes short' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'chamber group accepting bit of ravel's over' is the wordplay.
'chamber group' becomes 'quartet' (I've seen this in another clue).
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'bit of' indicates taking the first letters.
'over' becomes 'o' (cricket abbreviation).
The first letter of 'ravels' is 'r'.
'quartet' going around 'r' is 'quartert'.
'quartert'+'o'='QUARTER-TO'
Can you help me to learn more?
(Other definitions for quarter to that I've seen before include "15 before" , "time" , "Forty-five" .)