Crossword Genius

Play into each other's hands in using an old clue (7)

Ross

I believe the answer is:

collude

I'm a little stuck... Click here to teach me more about this clue!

'play into each other's hands' is the definition.
I can't judge whether this definition defines the answer.

'using an old clue' is the wordplay.
'using' is an anagram indicator (the letters used in a different way).
'old'+'clue'='oldclue'
'oldclue' with letters rearranged gives 'COLLUDE'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for collude that I've seen before include "Conspire fraudulently" , "Conspire to defraud" , "Be in cahoots" , "Agree in secret" , "Come to a secret and devious understanding" .)

I've seen this clue in The Irish Independent.
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