Crossword Genius

Make aggressive move at cards and clear what's left (9)

Ross

I believe the answer is:

overtrump

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'make aggressive move at cards' is the definition.
I can't tell whether this defines the answer.

'clear what's left' is the wordplay.
'clear' becomes 'overt' (I've seen this before).
'what's left' becomes 'rump' (I can't explain this - if you can you should believe this answer much more).
'overt'+'rump'='OVERTRUMP'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for overtrump that I've seen before include "use a superior club?" , "better" , "play ace?" , "Excel at trick" , "Win trick by playing higher card" .)

I've seen this clue in The Times.
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