Huge cable at the back: pull loop to secure it (8)
I believe the answer is:
towering
'huge' is the definition.
(thesaurus)
'back pull loop to secure it' is the wordplay.
'back pull' becomes 'tow' (tow is a kind of pull. I am not sure about the 'back' bit.).
'loop' becomes 'ring' (I've seen this in another clue).
'to secure' means one lot of letters goes inside another (inserted letters are secured inside).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'tow'+'ring'='towring'
'towring' enclosing 'e' is 'TOWERING'.
'cable at the' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for towering that I've seen before include "Very intense (rage)" , "Grew into (anag.)" , "Very tall" , "I get worn (anag)" , "Magnificent" .)