Regular at a park with half-pipes, informally

SKATERAT

Think of someone who might wear knee pads and a helmet while practicing ollies and grinds at a concrete playground.

This clue plays on two meanings of "regular." First, it hints at someone who frequents a park—specifically a skatepark, where you’d find half-pipes. The "informally" tip suggests slang, leading to "skater," and "rat" is a casual term for a regular or fixture in a place (like a "mall rat"). Combine them, and you get "SKATERAT," a slangy way to describe someone who’s always at the skatepark.