Hair in smoked salmon: reported (5)
I believe the answer is:
locks
'hair' is the definition.
(I've seen this before)
'smoked salmon reported' is the wordplay.
'smoked salmon' becomes 'lox' (lox is a kind of smoked salmon).
'reported' indicates a 'sounds like' (homophone) clue.
'lox' sounds like 'LOCKS'.
'in' acts as a link.
(Other definitions for locks that I've seen before include "Fastens - hair" , "Secures; person's hair" , "Clusters of hair" , "Secure fasteners for doors" , "Tresses" .)