Crushed mother by shed (6)
I believe the answer is:
mashed
'crushed' is the definition.
('mash' can be a synonym of 'crush')
'mother by shed' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'by' means one lot of letters go next to another.
'ma'+'shed'='MASHED'
(Other definitions for mashed that I've seen before include "Crushed to small pieces" , "Pulped as potatoes often are" , "Reduced to small pieces by pounding" , "Pulped or crushed as potatoes may be" , "Reduced to pulp" .)