Smart move by a tow-headed charmer (6)
I believe the answer is:
twitch
'smart move' is the definition.
'twitch' can be an answer for 'move' (I have seen 'Involuntary move' mean 'twitch' so perhaps 'move' could also mean 'twitch'). I am unsure of the 'smart' bit.
'by a tow-headed charmer' is the wordplay.
'by' says to put letters next to each other.
'a tow-headed' becomes 't' (this might be a standard abbreviation I've not previously seen).
'charmer' becomes 'witch' (someone who charms).
't'+'witch' is 'TWITCH'.
Can you help me to learn more?
(Other definitions for twitch that I've seen before include "Nervous jerk or tic" , "Quiver or jerk spasmodically" , "Involuntary move" , "Nervous action" , "Go looking for rare birds - spasmodic movement" .)