Crossword Genius

Though solid in form, they may have fragile footing (5)

Ross

I believe the answer is:

idols

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

'may have fragile footing' is the definition.
I can't tell whether this definition defines the answer.

'though solid in form they' is the wordplay.
'solid' can be anagrammed to 'IDOLS'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for idols that I've seen before include "Graven images sometimes worshipped" , "Effigies worshipped as gods" , "objects such as the Golden Calf" , "Objects of worship" , "False gods" .)

I've seen this clue in The Irish Independent and The Globe and Mail.
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