Twin-headed sorceress has a spasm (6)

I believe the answer is:

twitch

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'a spasm' is the definition.
(I know that twitch is a type of spasm)

'twin-headed sorceress' is the wordplay.
'twin-headed' becomes 't' (this could be a standard abbreviation of which I'm unaware).
'sorceress' becomes 'witch' (synonyms).
't'+'witch'='TWITCH'

'has' is the link.

Can you help me to learn more?

(Other definitions for twitch that I've seen before include "pluck" , "Muscle spasm" , "Twinge" , "Sudden jerk" , "Move spasmodically" .)

I've seen this clue in The Irish News.

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