Traveller's bid for extraordinary piece of text (4,2,7)
I believe the answer is:
bird of passage
'traveller's' is the definition.
(bird of passage is a kind of traveller)
'bid for extraordinary piece of text' is the wordplay.
'extraordinary' indicates an anagram.
'piece of text' becomes 'passage' (I've seen this before).
'bid'+'for'='bidfor'
'bidfor' with letters rearranged gives 'birdof'.
'birdof'+'passage'='BIRD OF PASSAGE'
(Other definitions for bird of passage that I've seen before include "transient" , "Migratory flyer" , "Migrant - wanderer" , "One who is just passing through" , "Swift, perhaps" .)