Crossword Genius

"Egg-whisk", in the lead, does lose its footing (7)

Ross

I believe the answer is:

stagger

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

'footing' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'egg-whisk in the lead does lose its' is the wordplay.
I cannot really understand how this works, but
an anagram of 'egg' is 'gge' which is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'sar' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for stagger that I've seen before include "Surprise" , "Teeter" , "Pitch" , "Lurch; astound" , "bowl over" .)

I've seen this clue in the Evening Standard.
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