Working in any available location, performing spicy duets, occasionally with Elvis? (3-7)

I believe the answer is:

hot-desking

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'working in any available location performing' is the definition.
The definition suggests a present participle verb which matches the answer.

'spicy duets occasionally with elvis?' is the wordplay.
'spicy' becomes 'hot' (synonyms).
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
'with' is a charade indicator (letters next to each other).
'elvis?' becomes 'king' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The alternating letters of 'duets' are 'des'.
'hot'+'des'+'king'='HOT-DESKING'

Can you help me to learn more?

I've seen this clue in The Irish Times.

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