Uncertainty of Sun's leader writers in employ (8)
I believe the answer is:
Here is my best explanation:
'uncertainty' is the definition.
(suspense is a kind of uncertainty)
'sun's leader writers in employ' is the subsidiary indication.
'leader' indicates taking the first letters.
'writers' becomes 'pens'.
'in' means one lot of letters goes inside another.
'employ' becomes 'use' ('use' can be a synonym of 'employ'**).
The first letter of 'suns' is 's'.
'pens' going within 'use' is 'uspense'.
'of' is the link.
(Other definitions for suspense that I've seen before include "Indecision", "Apprehension, anticipation", "Uncertain state", "Cessation", "Apprehension about what is going to happen", "Nervous or excited uncertainty", "feature of exciting fiction?", "State of nervous or excited tension or uncertainty", "State of uncertainty about the future" and "expectancy".)