Crossword Genius

Some boxes grocer emptied up in arms (5)

Ross

I believe the answer is:

angry

'up in arms' is the definition.
(thesaurus)

'some boxes grocer emptied' is the wordplay.
'some' becomes 'any' ('any' can be similar in meaning to 'some').
'boxes' indicates putting letters inside (the outside letters must 'box' inside letters in).
'emptied' means to remove the middle letters.
'grocer' with its centre removed is 'gr'.
'any' going around 'gr' is 'ANGRY'.

(Other definitions for angry that I've seen before include "Vexed" , "Upset" , "Furious" , "Irate, wrathful" , "In a paddy" .)

I've seen this clue in The Telegraph.
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