Beautiful appearance given to instrument quickly! (4,5)

I believe the answer is:

look sharp

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'beautiful appearance given to instrument quickly' is the definition.
I can't tell whether this defines the answer.

'appearance given to instrument quickly' is the wordplay.
'appearance' becomes 'looks' (I've seen this before).
'given to' says to put letters next to each other.
'instrument quickly' becomes 'harp' (harp is a kind of instrument. I am not sure about the 'quickly' bit.).
'looks'+'harp'='LOOK SHARP'

Can you help me to learn more?

(Other definitions for look sharp that I've seen before include "keen" , "Hurry up!" , "Be quick!" , "Get a move on" , "step on it" .)

I've seen this clue in The Independent.

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