Artists risk altering top of traditional mini? (2-2,5)

'mini?' is the definition.
(skirt similar to a mini skirt)

'artists risk altering top of traditional' is the wordplay.
'artists' becomes 'RA' (Royal Academy).
'top of' indicates taking the first letters.
'traditional' becomes 'skirt' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letters of 'risk altering' is 'ra'.
'ra'+'ra'+'skirt'='RA-RA SKIRT'