Crossword Genius

Angry, like baby being carried? (2,2,4)

Ross

I believe the answer is:

up in arms

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

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

'baby being carried?' is the wordplay.
I cannot really see how this works, but
'being' could be 'pi' (PI is an example) and 'pi' is present in the answer.
The remaining letters 'unarms' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'like' is the link.

Can you help me to learn more?

(Other definitions for up in arms that I've seen before include "Outraged" , "being angry" , "Indignant" , "held like a small child" , "Weapons expert should be" .)

I've seen this clue in The Telegraph.
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