A large bee can be pleasant (9)
I believe the answer is:
agreeable
'pleasant' is the definition.
(similar in meaning)
'a large bee can be' is the wordplay.
'can be' is an anagram indicator.
'large'+'bee'='largebee'
'largebee' with letters rearranged gives 'greeable'.
'a'+'greeable'='AGREEABLE'
(Other definitions for agreeable that I've seen before include "sympathetic" , "Pleasant, acceptable" , "In harmony; pleasant" , "delightful" , "Willing - nice" .)