Search countryside, or maybe beaches initially (4)
'search' is the definition.
(combing is a kind of searching)
'countryside or maybe beaches initially' is the wordplay.
'initially' indicates taking the first letters.
The first letters of 'countryside or maybe beaches' is 'COMB'.
(Other definitions for comb that I've seen before include "Something with teeth (for the hair!)", "Common hair tidier", "Carefully search", "Toothed implement - search (the area)", "Arrange".)