Endlessly peruse Playboy (4)
I believe the answer is:
stud
'playboy' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for stud that I've seen before include "Farm for breeding horses" , "Gripper under a boot" , "Boss; item of jewellery" , "Collar button or horse farm" , "Football boot's peg-like projection" .)