Traveller turns up clutching organ pipe cleaner? (7)
I believe the answer is:
plunger
'pipe cleaner?' is the definition.
(a plunger might be used to clean pipes)
'traveller turns up clutching organ' is the wordplay.
'traveller' becomes 'rep' (travel company worker).
'turns up' is a reversal indicator.
'clutching' is an insertion indicator.
'organ' becomes 'lung' (lung is a kind of organ).
'rep' reversed gives 'per'.
'per' placed around 'lung' is 'PLUNGER'.
(Other definitions for plunger that I've seen before include "Plumber's friend" , "Sink unblocker" , "Rubber device for clearing blocked pipes" , "Better" , "Device for clearing blocked drains" .)