Crossword Genius

Weakness arrivin'? (11)

Ross

I believe the answer is:

shortcoming

'weakness' is the definition.
(I've seen this before)

'arrivin'?' is the wordplay.
I cannot really understand how this works, but
'arrivin'?' could be 'comin' ('coming' pronounced like 'arriving' was; 'come' can be a synonym of 'arrive') and 'comin' is found in the answer.
This explanation may well be incorrect...

(Other definitions for shortcoming that I've seen before include "Fault, defect" , "drawback" , "Weakness" , "A failing" .)

I've seen this clue in The Times.
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