Maybe Tom Jones, when slam dancing (8)

I believe the answer is:

welshman

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'maybe tom jones' is the definition.
I can't tell whether this defines the answer.

'when slam dancing' is the wordplay.
'dancing' is an anagram indicator.
'when'+'slam'='whenslam'
'whenslam' with letters rearranged gives 'WELSHMAN'.

Can you help me to learn more?

(Other definitions for welshman that I've seen before include "Person from Anglesey, say" , "bloke from Cardiff?" , "Eg, Cardiff chap" , "Native of Cardiff" , "Bryn Terfel or Dylan Thomas, say" .)

I've seen this clue in The Telegraph.

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