Crossword Genius

Failing to start sleeping, being clumsy (9)

Ross

I believe the answer is:

lumbering

'clumsy' is the definition.
(thesaurus)

'failing to start sleeping' is the wordplay.
'failing to start' means to remove the first letter.
'sleeping' becomes 'slumbering' ('slumber' can be a synonym of 'sleep').
'slumbering' with its initial letter taken away is 'LUMBERING'.

'being' is the link.

(Other definitions for lumbering that I've seen before include "Awkward" , "Ponderous" , "Moving in heavy clumsy way" .)

I've seen this clue in The Telegraph.
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