Pro resigns when redeployed? It's happening (2,8)

I believe the answer is:

in progress

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

'it's happening' is the definition.
I can't judge whether this defines the answer.

'pro resigns when redeployed?' is the wordplay.
'when redeployed?' indicates an anagram.
'pro'+'resigns'='proresigns'
'proresigns' is an anagram of 'IN PROGRESS'.

Can you help me to learn more?

(Other definitions for in progress that I've seen before include "Under way" , "still going on" .)

I've seen this clue in The Irish Times.

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