This uses a container clue - one word or set of letters goes inside another word. Look for words that indicate something going into, around, or breaking something else.
"Breaking" is the container indicator. You need to put a shortened version of "dim" (remove the last letter for "endlessly") inside a word meaning "equipment".
Answer: KIDULT | "Equipment" = KIT, "dim" shortened "endlessly" (last letter removed) = DUL, and DUL goes inside ("breaking") KIT to give K-DUL-IT = KIDULT.