More than one sweet model flirts round earl (7)
I believe the answer is:
trifles
'more than one sweet' is the definition.
(trifle is a kind of sweet)
'model flirts round earl' is the wordplay.
'model' indicates anagramming the letters (the solver must model the letters into a new form).
'round' is an insertion indicator.
'earl' becomes 'e'.
'flirts' anagrammed gives 'trifls'.
'trifls' placed around 'e' is 'TRIFLES'.
(Other definitions for trifles that I've seen before include "Toys" , "Behaves frivolously for popular desserts" .)