Crossword Genius

Act unwisely and get lost (4,2)

Ross

I believe the answer is:

beat it

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

'get lost' is the definition.
(both can be used to tell someone to go away)

'act unwisely' is the wordplay.
'act' becomes 'beat' (beat is a kind of act).
'unwisely' becomes 'it' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'beat'+'it'='BEAT IT'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for beat it that I've seen before include "make off furtively" , "try out drum kit?" , "leave" , "Scarper" , "Scram, get lost" .)

I've seen this clue in The Guardian.
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