Bishop falling into lake in African country like a shot? (9)

'like a shot?' is the definition.
(a bullet or shot may be in the chamber of a gun)

'bishop falling into lake in african country' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'falling into' indicates putting letters inside.
'lake' becomes 'mere' (mere is a kind of lake).
'in' indicates putting letters inside.
'african country' becomes 'chad' (country in Africa).
'b' going inside 'mere' is 'mbere'.
'mbere' put inside 'chad' is 'CHAMBERED'.