Pam's disco dancing is somewhat erratic (9)

I believe the answer is:

spasmodic

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'somewhat erratic' is the definition.
'spasmodic' can be an answer for 'erratic' (thesaurus). I am not certain of the 'somewhat' bit.

'pam's disco dancing' is the wordplay.
'dancing' indicates an anagram.
'pams'+'disco'='pamsdisco'
'pamsdisco' anagrammed gives 'SPASMODIC'.

'is' is the link.

Can you help me to learn more?

(Other definitions for spasmodic that I've seen before include "Occurring in irregular bursts" , "fitfully" , "Done in short bursts" , "Occasional" , "Done in brief irregular bursts" .)

I've seen this clue in The Times.

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