Comprehend Shakespearean king and knight (5)
I believe the answer is:
learn
'comprehend' is the definition.
(I've seen this before)
'shakespearean king and knight' is the wordplay.
'shakespearean king' becomes 'Lear' (King Lear).
'and' means one lot of letters go next to another.
'knight' becomes 'N' (chess abbreviation).
'lear'+'n'='LEARN'
(Other definitions for learn that I've seen before include "Find out - assimilate facts" , "Gain knowledge or skills" , "be taught a lesson" , "Be educated" , "Hear - memorise" .)