Stretched out and let go end of rope (9)
I believe the answer is:
elongated
'stretched' is the definition.
('elongate' can be a synonym of 'stretch')
'out and let go end of rope' is the wordplay.
'out' is an anagram indicator.
'end of' indicates one should take the final letters.
The last letter of 'rope' is 'e'.
'and'+'let'+'go'+'e'='andletgoe'
'andletgoe' is an anagram of 'ELONGATED'.
(Other definitions for elongated that I've seen before include "Stretched" , "Put on stretcher" , "Go al dente to be lengthened or prolonged" , "going further" , "Dangle toe (anag)" .)