What's behind odious stuff beat it (5)

I believe the answer is:

scram

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

'what's behind odious stuff' is the wordplay.
'what's behind odious' becomes 'sc' (I can't explain this - if you can you should give a lot more credence to this answer).
'stuff' becomes 'ram' (ram can mean to stuff or push).
'sc'+'ram'='SCRAM'

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(Other definitions for scram that I've seen before include "Hop it!" , "Skedaddle!" , "make emergency shut-down" , "Make oneself scarce" , "Leave hurriedly" .)

I've seen this clue in The Daily Express.

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