Crossword Genius

Double Dutch: A tip for lookers! (4)

Ross

I believe the answer is:

dual

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'double' is the definition.
(I know that double can be written as dual)

'dutch a tip for lookers' is the wordplay.
'dutch' becomes 'du' (I've seen this in other clues).
'a tip' says the letters should be written in reverse (I've seen 'tipping' mean this).
'for lookers' becomes 'la' (I can't justify this - if you can you should believe this answer much more).
'la' back-to-front is 'al'.
'du'+'al'='DUAL'

Can you help me to learn more?

(Other definitions for dual that I've seen before include "Consisting of pairs" , "Consisting of two parts" , "Double" , "Twofold" , "Having two distinct functions" .)

I've seen this clue in The Independent.
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