Trace the damaged tube (8)
I believe the answer is:
catheter
'tube' is the definition.
(I've seen this before)
'trace the damaged' is the wordplay.
'damaged' indicates anagramming the letters.
'trace'+'the'='tracethe'
'tracethe' is an anagram of 'CATHETER'.
(Other definitions for catheter that I've seen before include "Thin flexible tube to withdraw fluids from the body" , "Medical tube to remove waste from body - heart etc (anag)" , "Long, thin flexible tube for medical use" , "Trace the strange tube used medically" .)