Clue: Features of Barnet clearly detailed by Eliot's precursors? (6)
Answer: PLAITS
Explanation: Definition: Features of Barnet
 "plain"(clearly/without any ambiguity) **minus ****its last letter**(detailed) + T.S.(the letters before/precursors to "Eliot", the last name of a major poet).
Defn: …, the latter being rhyming slang for "hair", from "Barnet Fair".