To hinder from grasping power, I deem wrong (6)
I believe the answer is:
impede
'to hinder' is the definition.
(synonyms)
'grasping power i deem wrong' is the wordplay.
'grasping' means one lot of letters goes inside another (inserted letters are held or grasped).
'power' becomes 'p' (symbol in physics).
'wrong' is an anagram indicator.
'i'+'deem'='ideem'
'ideem' anagrammed gives 'imede'.
'p' inserted within 'imede' is 'IMPEDE'.
'from' is the link.
(Other definitions for impede that I've seen before include "Interfere with progress" , "Hamper" , "Hinder, be obstructive" , "Handicap" , "Hold back" .)