Is he more clever than Bobby? (4)
I believe the answer is:
dick
'bobby?' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for dick that I've seen before include "-- Turpin" , "See 20 Across" , "Detective (slang) - one of the 14 films" , "may be spotted eating" , "10 <SLEUTH]" .)