25 across
Sequence
logged
by
gentleman,
resubmitted
when
typed
the
wrong
way?
(8)
Sequence logged by gentleman, resubmitted when typed the wrong way? (8)
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The definition is at the beginning of the clue.
How the clue works
Look at Sequence logged by — that's your definition, since it's what you type to log in. The sneaky bit is that the answer is hidden inside "gentleMAN, RESUbmitted" but reading backwards ("typed the wrong way"), and sure enough those letters give you USERNAME in reverse.