French leader's work trip underhand? (10)
I believe the answer is:
mitterrand
'french leader's work trip underhand?' is the definition.
I can't judge whether this definition defines the answer.
'french leader's work trip' is the wordplay.
'french leader's work' becomes 'mitt' (I am not sure about this - if you are sure you should believe this answer much more).
'trip' becomes 'errand' (errand is a kind of trip).
'mitt'+'errand'='MITTERRAND'
(Other definitions for mitterrand that I've seen before include "President" , "Old statesman" , "Foreign statesman" , "Ex-President" .)