Spend a long time in corridor (7)
I believe the answer is:
passage
'corridor' is the definition.
(I've seen this before)
'spend a long time' is the wordplay.
'spend' becomes 'pass' (synonyms).
'a long time' becomes 'age' (an age is a period of time).
'pass'+'age'='PASSAGE'
'in' is the link.
(Other definitions for passage that I've seen before include "Channel" , "Section of musical or literary work" , "Piece of text or music" , "Way through; sea journey" , "Alley - corridor" .)