All there when I enter in some agitation (6)

I believe the answer is:

entire

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'all' is the definition.
(I've seen this in another clue)

'there when i enter in some agitation' is the wordplay.
'i enter' can be anagrammed to 'ENTIRE'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for entire that I've seen before include "Whole - undamaged" , "excluding nothing" , "With no part left out" , "Envelope" , "Whole; absolute" .)

I've seen this clue in The Irish News.

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