Cricket club holding on to girl — one of the highest quality (7)
I believe the answer is:
classic
'of the highest quality' is the definition.
(I've seen this before)
'cricket club holding on to girl one' is the wordplay.
'cricket club' becomes 'cc'.
'holding' indicates putting letters inside.
'on' is a charade indicator (letters next to each other).
'to girl' becomes 'lass' (lass is a kind of girl**).
'one' becomes 'i' (Roman numeral).
'lass' put next to 'i' is 'lassi'.
'cc' placed around 'lassi' is 'CLASSIC'.
(Other definitions for classic that I've seen before include "Of the highest order - the Derby, for example" , "Creation of the highest standard" , "Remarkably typical" , "Traditional" , "Recognised as excellent" .)