Crossword Genius

Knock rogue for concealing a piece of rubbish (7)

Ross

I believe the answer is:

ratatat

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'knock rogue' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'concealing a piece of rubbish' is the wordplay.
'concealing' means one lot of letters goes inside another.
'piece of' becomes 'rta' (I can't explain this - if you can you should believe this answer much more).
'rubbish' becomes 'tat' (tat can mean rubbish or poor-quality material).
'a' placed inside 'rta' is 'rata'.
'rata'+'tat'='RATATAT'

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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