Fool Russian leader to be taken in by satellite (5)
I believe the answer is:
moron
'fool' is the definition.
(I've seen this in another clue)
'russian leader to be taken in by satellite' is the wordplay.
'leader' says to take the initial letters.
'to be taken in by' indicates putting letters inside.
'satellite' becomes 'moon' (moon is a kind of satellite).
The initial letter of 'russian' is 'r'.
'r' placed into 'moon' is 'MORON'.
(Other definitions for moron that I've seen before include "Cretin" , "Complete imbecile" , "Person of subnormal intelligence" , "Blockhead" , "Somewhat feeble-minded person" .)