Quacks firstly from ducks observed crossing rocky hills (7)

From Daily Telegraph Cryptic 31273, 2D

2D — Quacks firstly from ducks observed crossing rocky hills (7) — DOCTORS

  • Definition
    Definition found: 'Quacks' — The straight definition sits at one end of the clue — which end reads as a plain, if slangy, synonym for the answer?
  • Indicator
    Indicator found: 'firstly'
  • Operation
    'firstly' signals a letter_selection operation
  • Fodder
    Fodder: 'ducks observed crossing'
  • Synonym
    Synonyms spotted: 'rocky hills' → TORS
  • Assembly
    DOC + TORS = DOCTORS

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