Command of knighthood? (5)
I believe the answer is:
order
I believe this clue is a double definition.
'command' is the first definition.
(I know that order is a type of command)
'knighthood?' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for order that I've seen before include "Instruction - arrangement" , "Directive or society" , "Command or requisition." , "Reserved goods" , "plan to reorganise Europe with 1a [NEW]" .)