Excel mode in which a new spreadsheet closes initially? (9)
'excel' is the definition.
(transcending is a kind of excelling)
'mode in which a new spreadsheet closes initially?' is the wordplay.
'mode' becomes 'trend' (I've seen this before**).
'in which' indicates putting letters inside.
'initially?' suggests taking the first letters (I've seen 'initially' mean this).
The first letters of 'new spreadsheet closes' is 'nsc'.
'trend' going around 'ansc' is 'TRANSCEND'.
(Other definitions for transcend that I've seen before include "Go beyond, surpass", "Rise above", "Surpass (an achievement)", "exceed?".)