Crossword Genius

Shower was lined beneath exterior gaslight (9)

Ross

I believe the answer is:

brainwash

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'shower was lined beneath exterior gaslight' is the definition.
I can't tell whether this definition defines the answer.

'shower was lined beneath exterior' is the wordplay.
'shower' becomes 'rain' (synonyms).
'lined beneath' becomes 'bh' (I can't explain this - if you can you should believe this answer much more).
'exterior' means one lot of letters goes inside another (some letters go on the outside of others).
'rain'+'was'='rainwas'
'rainwas' going into 'bh' is 'BRAINWASH'.

Can you help me to learn more?

(Other definitions for brainwash that I've seen before include "Condition" , "clean mind?" , "Coerce into belief" , "Completely indoctrinate" , "Subject someone to stressful indoctrination" .)

I've seen this clue in the Sydney Morning Herald.
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