Meat and fibre in hamper (9)
I believe the answer is:
hamstring
'hamper' is the definition.
(hamstring can mean to hamper or obstruct)
'meat and fibre' is the wordplay.
'meat' becomes 'ham' (ham is a kind of meat).
'and' says to put letters next to each other.
'fibre' becomes 'string' (both can mean a cord or strand).
'ham'+'string'='HAMSTRING'
'in' is the link.
(Other definitions for hamstring that I've seen before include "Impede" , "Cramp the style of" , "Tendons at back of the knee" , "Tendon behind the knee" , "Tendon at back of knee" .)