Consider head of state's surrounded by idiots (6)
I believe the answer is:
assess
'consider' is the definition.
(thesaurus)
'head of state's surrounded by idiots' is the wordplay.
'head of' says to take the initial letters.
'surrounded by' means one lot of letters goes inside another.
'idiots' becomes 'asses' (I've seen this before).
The initial letter of 'state' is 's'.
's' going inside 'asses' is 'ASSESS'.
(Other definitions for assess that I've seen before include "Appraise, estimate value" , "Judge the quality of" , "Evaluate, estimate" , "Make estimate or appraisal of" , "Rate, evaluate" .)