Fool nabbed by servant in corridor (7)
I believe the answer is:
passage
'corridor' is the definition.
(thesaurus)
'fool nabbed by servant' is the wordplay.
'fool' becomes 'ass' (ass is a kind of fool).
'nabbed by' is an insertion indicator (nab can mean to steal or take possession of).
'servant' becomes 'page' (I've seen this before).
'ass' inserted within 'page' is 'PASSAGE'.
'in' is the link.
(Other definitions for passage that I've seen before include "Way through something" , "Some reading" , "Channel" , "course" , "Literary extract" .)