Haul back organ for traveller (8)
I believe the answer is:
gulliver
'for traveller' is the definition.
(I've seen this before)
'haul back organ' is the wordplay.
'haul' becomes 'lug' (I've seen this before).
'back' says the letters should be written in reverse.
'organ' becomes 'liver' (liver is a kind of organ).
'lug' back-to-front is 'gul'.
'gul'+'liver'='GULLIVER'
(Other definitions for gulliver that I've seen before include "Dean Swift's travelling man" , "Swift man" , "Dean Swift's fictional traveller" , "Lilliput visitor" .)