Take the bait (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
bite
'take the bait' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bite that I've seen before include "Get teeth into" , "Grip; take effect" , "Puncture by 9 [ADDER]" , "Snake or insect wound" , "Take bait; sting" .)