After church, queen left for station (7)
I believe the answer is:
channel
'for station' is the definition.
(TV channel)
'after church queen left' is the wordplay.
'after' means one lot of letters go next to another.
'church' becomes 'ch' (common abbreviation).
'queen' becomes 'anne' (Queen Anne, 18th-century queen).
'left' becomes 'L' (common abbreviation).
'ch' put next to 'anne' is 'channe'.
'channe'+'l'='CHANNEL'
(Other definitions for channel that I've seen before include "Bed of a stream; medium" , "Narrow body of water linking two larger bodies" , "Navigable passage" , "Length of water between two land masses" , "Gutter; medium" .)