20 across
A
fibre
carpet
used
to
make
flatpack
kit,
say
(12)
A fibre carpet used to make flatpack kit, say (12)
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The definition is at the end of the clue.
How the clue works
Look at to make flatpack kit, say — that's your definition, the idea of manufacturing components in advance ready for assembly. Then "used" is nudging you towards an anagram, and sure enough the letters of A fibre carpet can be rearranged to give you your answer.