Three killers concealing pong (4)

I believe the answer is:

reek

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

'three killers concealing' is the wordplay.
'concealing' indicates a hidden word.
'REEK' can be found hidden inside 'three killers'.

(Other definitions for reek that I've seen before include "Smell unpleasant" , "Emit smoke" , "Does Croagh Patrick smell?" , "Foul smell; smoke (Sc.)" , "Fume" .)

I've seen this clue in The Sun.

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