12 across
Childish
type,
endlessly
dim,
breaking
equipment
(6)
Childish type, endlessly dim, breaking equipment (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Childish type — one of those portmanteau words blending kid and adult. dim gives you DULL, which loses its last letter ("endlessly") to leave DUL, and that gets inserted into equipment (KIT) — "breaking" it apart — to give you KI-DUL-T.