18 down
Labour
adopts
works
creating
best
medium
for
growth
(7)
Labour adopts works creating best medium for growth (7)
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The definition is at the end of the clue.
How the clue works
Right, so best medium for growth is the definition — that's topsoil, the fertile top layer of earth. For the wordplay, take TOIL (labour) and have it adopt, or swallow up, OPS (works) inside it — TOIL wraps around OPS to give you T-OPS-OIL.