Stretch where angler repositioned line, finally (7)
I believe the answer is:
enlarge
'stretch' is the definition.
(I've seen this before)
'angler repositioned line finally' is the wordplay.
'repositioned' indicates an anagram.
'finally' suggests the final letters.
The last letter of 'line' is 'e'.
'angler' is an anagram of 'enlarg'.
'enlarg'+'e'='ENLARGE'
'where' is the link.
(Other definitions for enlarge that I've seen before include "Blow up" , "Magnify in general way" , "Lengthen" , "Expatiate" , "Make bigger in general" .)