Crossword Genius

Male in the morning penning antelope in oversize container (6)

Ross

I believe the answer is:

magnum

'oversize container' is the definition.
(large wine bottle)

'male in the morning penning antelope' is the wordplay.
'male' becomes 'm' (common abbreviation).
'in the morning' becomes 'am' (AM on a clock).
'penning' indicates putting letters inside.
'antelope' becomes 'gnu' (gnu is a kind of antelope).
'am' enclosing 'gnu' is 'agnum'.
'm'+'agnum'='MAGNUM'

'in' is the link.

(Other definitions for magnum that I've seen before include "Twice the normal-size wine bottle" , "Size of wine bottle; gun" , "1.5 litre wine bottle" , "Two champers bottles in one" , "1 1/2 litre champagne bottle" .)

I've seen this clue in The Telegraph.
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