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Publicity before performance — I celebrate, getting ready (10)

Ross

I believe the answer is:

practising

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'getting ready' is the definition.
Although both the answer and definition are present participle verbs, I don't understand how they can define each other.

'publicity before performance i celebrate' is the wordplay.
'publicity' becomes 'PR' (public relations).
'before' is a charade indicator (letters next to each other).
'performance' becomes 'act' (act is a kind of performance).
'celebrate' becomes 'sing' (as in to sing someone's praises).
'pr'+'act'+'i'+'sing'='PRACTISING'

Can you help me to learn more?

(Other definitions for practising that I've seen before include "Rehearsing" , "Observing" , "working as a lawyer?" , "Engaged in (a profession)" .)

I've seen this clue in The Times.
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