Crossword Genius

Incomplete hump sure to return in an arm bone (7)

Ross

I believe the answer is:

humerus

'an arm bone' is the definition.
(humerus is a kind of arm bone)

'incomplete hump sure to return' is the wordplay.
'incomplete' means to remove the last letter.
'to return' is a reversal indicator.
'sure' written backwards gives 'erus'.
'hump' with its last letter taken away is 'hum'.
'hum'+'erus'='HUMERUS'

'in' acts as a link.

(Other definitions for humerus that I've seen before include "Upper arm bone" , "Arm bone - the "funny bone"" , "Arm bone (that sounds comical)" , "Bone from shoulder to elbow" , "Boneo of the upper arm" .)

I've seen this clue in the Sydney Morning Herald.
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