12 across
Something
guaranteed,
that
is
incorporating
fact
I
managed
to
get
qualification
(11)
Something guaranteed, that is incorporating fact I managed to get qualification (11)
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The definition is at the end of the clue.
How the clue works
The definition is qualification, meaning a certificate. CERT (something guaranteed) is followed by IE (abbreviation for 'that is') incorporating an anagram of 'fact I' (managed) giving FICAT inside to form I-FICAT-E.