Crossword Genius

Comes a cropper holding up killers (5)

Ross

I believe the answer is:

orcas

'killers' is the definition.
('orca' can be a synonym of 'killer')

'comes a cropper holding up' is the wordplay.
'holding' indicates the answer is hidden within the clue.
'up' is a reversal indicator (in down clue: letters go upwards).
'sacro' is hidden in the letters of 'comes a cropper'.
'sacro' reversed gives 'ORCAS'.

(Other definitions for orcas that I've seen before include "Killer whales" , "Killers" .)

I've seen this clue in The Telegraph.
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