Pipelike (7)
I believe the answer is:
tubular
'pipelike' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tubular that I've seen before include "Tube-like" , "Shaped like a pipe" , "Like a length of pipe" , "Hollow and cylindrical" , "In the form of a pipe" .)