Like certain bone's current deficiency largely restricting one (5)
I believe the answer is:
iliac
'like certain bone's' is the definition.
(relating to the ilium bone)
'current deficiency largely restricting one' is the wordplay.
'current' becomes 'I' (symbol for electric current).
'deficiency' becomes 'lack' (synonyms).
'largely' means to remove the last letter.
'restricting' is an insertion indicator.
'one' becomes 'I' (Roman numeral).
'lack' with its final letter taken away is 'lac'.
'lac' enclosing 'i' is 'liac'.
'i'+'liac'='ILIAC'
(Other definitions for iliac that I've seen before include "Trojan" , "bottom of a hip bone" , "Relating to part of the hip bone" , "hipbone" , "Like certain body parts" .)