Crossword Genius

Has a mother's a flipping treat knocked off her trolley? (2,3,2,1,6)

Ross

I believe the answer is:

as mad as a hatter

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

'off her trolley?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'has a mother's a flipping treat knocked' is the wordplay.
'mother's' becomes 'dams' (female parent of an animal).
'flipping' shows that the letters should be reversed in order.
'knocked' indicates an anagram.
'has'+'a'+'dams'+'a'='hasadamsa'
'hasadamsa' backwards is 'asmadasah'.
'treat' anagrammed gives 'atter'.
'asmadasah'+'atter'='AS MAD AS A HATTER'

Can you help me to learn more?

(Other definitions for as mad as a hatter that I've seen before include "Troubled, as one responsible for tiles" , "having a tile loose?" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app