Disturbing sleepyheads, yap away, being carelessly unobservant (8)

I believe the answer is:

heedless

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'carelessly unobservant' is the definition.
'heedless' can be an answer for 'unobservant' (synonyms). I am not sure about the 'carelessly' bit.

'disturbing sleepyheads yap away' is the wordplay.
'disturbing' is an anagram indicator (I've seen this in other clues).
'away' suggests deleting specific letters.
'sleepyheads' with 'yap' taken out is 'sleeheds'.
'sleeheds' is an anagram of 'HEEDLESS'.

'being' is the link.

Can you help me to learn more?

(Other definitions for heedless that I've seen before include "Taking no notice" , "Paying no attention, to advice or danger" , "Incautious" , "Led Hesse (anag)" , "Taking no thought" .)

I've seen this clue in The Irish Times.

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