Work and shower in a garden store (8)
I believe the answer is:
toolshed
'a garden store' is the definition.
The definition suggests a singular noun which matches the answer.
'work and shower in' is the wordplay.
'work' becomes 'tool' (tooling is a kind of working).
'and' is a charade indicator (letters next to each other).
'shower in' becomes 'shed' (I can't justify this - if you can you should give a lot more credence to this answer).
'tool'+'shed'='TOOLSHED'
Can you help me to learn more?
(Other definitions for toolshed that I've seen before include "Home for spanners and saws?" , "Where to keep spades, trowels, etc" , "In which to keep work implements" , "Store for garden implements" .)