Fool trapped by secure record (7)
I believe the answer is:
monitor
'record' is the definition.
(I've seen this before)
'fool trapped by secure' is the wordplay.
'fool' becomes 'nit' (I've seen this before).
'trapped by' is an insertion indicator.
'secure' becomes 'moor' (mooring is a kind of securing).
'nit' inserted within 'moor' is 'MONITOR'.
(Other definitions for monitor that I've seen before include "giant lizard" , "Checking device - VDU - lizard" , "Observe over time" , "Display device" , "Large lizard; TV screen" .)