9 across
Transport
doctor
secures
undertaking
to
show
damaging
output
(6,9)
Transport doctor secures undertaking to show damaging output (6,9)
hints
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hints
The definition is at the end of the clue.
How the clue works
Look at damaging output — that's your definition. CAR (transport) and BONES (the doctor, nicknamed 'Bones') together give you CARBONES, which then *secures* (contains) MISSION (undertaking) inside it — slot MISSION into CARBONES and you get CARBONE-MISSION-S, which is your answer.