Crossword Genius

If you want a tow-headed charmer, move smartly (6)

Ross

I believe the answer is:

twitch

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

'move smartly' is the definition.
'twitch' can be an answer for 'move' (twitching is a kind of moving). I'm not certain of the 'smartly' bit.

'if you want a tow-headed charmer' is the wordplay.
I cannot really see how this works, but
'charmer' could be 'witch' (someone who charms) and 'witch' is found in the answer.
A single letter 't' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for twitch that I've seen before include "Uncontrolled, jerky motion" , "Quiver or jerk spasmodically" , "Spasmodic jerk" , "Pang, tic" , "Sudden jerk" .)

I've seen this clue in the Evening Standard.
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