Crossword Genius

Wire guards about germanium and sulphur (5)

Ross

I believe the answer is:

cages

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

'wire guards' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'about germanium and sulphur' is the wordplay.
'about' becomes 'ca' (abbreviation for 'circa').
'germanium' becomes 'Ge' (Ge is the chemical symbol for germanium).
'and' is a charade indicator (letters next to each other).
'sulphur' becomes 'S' (synonyms).
'ca'+'ge'+'s'='CAGES'

Can you help me to learn more?

(Other definitions for cages that I've seen before include "Enclosures made or wire or metal bars" , "prisons" , "Locks up" , "Wild animal enclosures" , "Enclosures for animals" .)

I've seen this clue in the Sydney Morning Herald.
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