Crossword Genius

Questionable resolve shown by personal trainer having ignored alarm clock? (9)

Ross

I believe the answer is:

overslept

I'm a little stuck... Click here to teach me more about this clue!

'ignored alarm clock?' is the definition.
Although both the answer and definition are past participle verbs, I don't see how they can define each other.

'questionable resolve shown by personal trainer' is the wordplay.
'questionable' indicates an anagram.
'shown by' means one lot of letters go next to another.
'personal trainer' becomes 'pt' (this might be a standard abbreviation of which I'm unaware).
'resolve' anagrammed gives 'oversle'.
'oversle'+'pt'='OVERSLEPT'

'having' acts as a link.

Can you help me to learn more?

(Other definitions for overslept that I've seen before include "Was late rising" , "Failed to rise on time" .)

I've seen this clue in The Independent.
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