Needing little effort in the asylum (4)
I believe the answer is:
easy
'needing little effort' is the definition.
(I've seen this in another clue)
'in the asylum' is the wordplay.
'in' indicates a hidden word.
'EASY' is hidden within 'the asylum'.
(Other definitions for easy that I've seen before include "in plentiful supply" , "Not rocket science" , "Presenting no problems" , "Comfortable" , "careful!" .)