Appealing in case of sentence being over ten years, initially (4)
I believe the answer is:
sexy
'appealing' is the definition.
(I've seen this in another clue)
'case of sentence being over ten years initially' is the wordplay.
'case of' means to remove the middle letters (like emptying a case).
'being over' means one lot of letters go next to another.
'ten' becomes 'X' (Roman numeral).
'initially' says to take the initial letters.
'sentence' with its centre taken out is 'se'.
The initial letter of 'years' is 'y'.
'se'+'x'+'y'='SEXY'
'in' is the link.
(Other definitions for sexy that I've seen before include "Voluptuous" , "Very appealing" , "Hot" , "Seductive" , "Alluring" .)