Crossword Genius

An altogether singular basketful? (4)

Ross

I believe the answer is:

eggs

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

'an altogether' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'singular basketful?' is the wordplay.
I cannot quite understand how this works, but
'singular' could be 's' (abbreviation in grammar) and 's' is found within the answer.
The remaining letters 'egg' 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 eggs that I've seen before include "Incites - farm produce" , "Bombs or mines (slang)" , "Ova" , "Don't teach your grandmother to suck --" , "Bacon and - -" .)

I've seen this clue in the Evening Standard.
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