Target of this perhaps bit sailor from behind? (3,4)
I believe the answer is:
rat trap
'target of this' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'bit sailor from behind?' is the wordplay.
'bit' becomes 'part' (I've seen this in other clues).
'sailor' becomes 'tar' (slang term for a sailor).
'from behind?' says the letters should be written in reverse (I've seen 'from behind' mean this).
'part'+'tar'='parttar'
'parttar' in reverse letter order is 'RAT-TRAP'.
'perhaps' is the link.
(Other definitions for rat trap that I've seen before include "in which pest caught" , "might this stop his desertion?" , "foothold" , "Rodent-catcher" , "pedal" .)