One hug may be sufficient (6)
I believe the answer is:
enough
'sufficient' is the definition.
(similar in meaning)
'one hug may be' is the wordplay.
'may be' is an anagram indicator.
'one'+'hug'='onehug'
'onehug' with letters rearranged gives 'ENOUGH'.
(Other definitions for enough that I've seen before include "The quantity needed, sufficient" , "Adequately" , "Satisfactory quantity" , "As many as are required" , "Adequate, sufficient" .)