10/11 across
Day
chosen
for
replacement
of
corps
in
retiring
company,
generating
some
power
(6-8)
Day chosen for replacement of corps in retiring company, generating some power (6-8)
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The definition is at the end of the clue.
How the clue works
The definition is generating some power, describing a hybrid power system using diesel engines and electric generators. DIES is Latin for "Day", then take CIRCLE (meaning "company", as in someone's circle), reverse it to get ELCRIC, remove the C ("corps"), and slot in ELECT ("chosen") where that C was — giving you EL-ECTRI-C — then stick it all together after DIES for the full answer.