It's a lot more than a short skirt, note (5)
I believe the answer is:
minim
'note' is the definition.
(type of musical note)
'it's a lot more than a short skirt' is the wordplay.
'it's a lot' becomes 'm'.
'more than' says to put letters next to each other.
'a short skirt' becomes 'mini' (mini skirt).
'm' after 'mini' is 'MINIM'.
(Other definitions for minim that I've seen before include "Feature of a score" , "Palindromic note" , "It's a downward stroke" , "A note in music, half as long as a semi-breve- it's a palindrome" , "Half-semibreve" .)