Infamous old port guarded by other people? (9)
I believe the answer is:
notorious
'infamous' is the definition.
(I know that infamous can be written as notorious)
'old port guarded by other people?' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'port' becomes 'rio' (Rio de Janeiro is a port).
'guarded by' means one lot of letters goes inside another.
'other people?' becomes 'notus'.
'o'+'rio'='orio'
'orio' placed inside 'notus' is 'NOTORIOUS'.
(Other definitions for notorious that I've seen before include "Disreputable - 1946 Hitchcock classic" , "Having a bad name" , "Famous for something bad" , "Famous for bad deeds" , "Disgraceful" .)