Crossword Genius

Lining up is unique, e.g. when dancing (8)

Ross

I believe the answer is:

queueing

I'm a little stuck... Click here to teach me more about this clue!

'lining up' is the definition.
The definition and answer can be both to do with motion as well as being present participle verbs.
Perhaps there's an association between them I don't understand?

'unique e g when dancing' is the wordplay.
'when dancing' indicates anagramming the letters (letters dance around).
'unique'+'e'+'g'='uniqueeg'
'uniqueeg' is an anagram of 'QUEUEING'.

'is' is the link.

Can you help me to learn more?

(Other definitions for queueing that I've seen before include "Standing in line" , "Waiting in line" .)

I've seen this clue in the Sydney Morning Herald.
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