Crossword Genius

Mum left with fat bird (7)

Ross

I believe the answer is:

mallard

'bird' is the definition.
(mallard is a kind of bird)

'mum left with fat' is the wordplay.
'mum' becomes 'ma' (ma can mean mother).
'left' becomes 'L' (common abbreviation).
'with' is a charade indicator (letters next to each other).
'fat' becomes 'lard' (lard is a kind of fat).
'ma'+'l'+'lard'='MALLARD'

(Other definitions for mallard that I've seen before include "Kind of duck" , "web-footed bird" , "Ancestor of all domestic ducks" , "Type of duck - world speed record holding steam engine (1938)" , "Oldest breed of duck" .)

I've seen this clue in The Sun.
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