25 across
Naturally
produced
grain
ruined
through
company
backtracking
(7)
Naturally produced grain ruined through company backtracking (7)
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The definition is at the beginning of the clue.
How the clue works
See Naturally produced sitting there as the definition, that's what we're aiming for. For the wordplay, take "company" as CO, and "backtracking" tells you to flip it round to OC, then you stuff an anagram of GRAIN (signalled by "ruined") right inside that reversed OC — giving you O, then RGANI, then C, all strung together to spell out the answer.