Urge seizing philosopher, left asking for nothing (10)
I believe the answer is:
Here is my best explanation:
'asking for nothing' is the definition.
'urge seizing philosopher left' is the subsidiary indication.
'urge' becomes 'press' ('press' can be a synonym of 'urge'**).
'seizing' indicates putting letters inside.
'philosopher' becomes 'ayer' (AJ Ayer).
'left' becomes 'l' (common abbreviation).
'press' enclosing 'ayerl' is 'prayerless'.