Crossword Genius

Caterer sighs when moving box full of bread (4,8)

Ross

I believe the answer is:

cash register

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'box full of bread' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'caterer sighs when moving' is the wordplay.
'when moving' is an anagram indicator (I've seen this in other clues).
'caterer'+'sighs'='caterersighs'
'caterersighs' is an anagram of 'CASH REGISTER'.

Can you help me to learn more?

(Other definitions for cash register that I've seen before include "Machine used in shops" , "money machine" , "Shop till" , "one may advise change" .)

I've seen this clue in The Telegraph.
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