Enthusiastic ward entrusted in part (6)
I believe the answer is:
'enthusiastic' is the definition.
(similar in meaning)
'ward entrusted in part' is the wordplay.
'in part' says the answer is hidden in the clue.
'ARDENT' is hidden in the letters of 'ward entrusted'.
(Other definitions for ardent that I've seen before include "Zealous - ranted (anag)", "Hot", "Fiery and zealous", "Enthusiastic, eager", "Warm and loving".)