Dolt? One male celeb, I suspect (8)
I believe the answer is:
imbecile
'dolt?' is the definition.
(thesaurus)
'one male celeb i suspect' is the wordplay.
'one' becomes 'i' (Roman numeral).
'male' becomes 'm' (common abbreviation).
'suspect' is an anagram indicator.
'celeb'+'i'='celebi'
'celebi' anagrammed gives 'becile'.
'i'+'m'+'becile'='IMBECILE'
(Other definitions for imbecile that I've seen before include "Silly person or idiot" , "Dolt" , "A mentally deficient or stupid person" , "Numbskull" , "Sap" .)