Oddly taking things off in train, Bob doing strip (6)
I believe the answer is:
ribbon
'strip' is the definition.
(ribbon is a kind of strip)
'oddly taking things off in train bob doing' is the wordplay.
'oddly taking things off in' means one should take alternating letters.
'train'+'bob'+'doing'='trainbobdoing'
The alternating letters of 'trainbobdoing' are 'RIBBON'.
(Other definitions for ribbon that I've seen before include "Thin strip of material" , "Narrow strip of material for decoration" , "Thin strip of cloth" , "Material tied in a bow, perhaps?" , "Tape - strip" .)