Pressurised container is able to go behind shower (5,3)
I believe the answer is:
spray can
'shower' is the definition.
(thesaurus)
'pressurised container is able to go behind' is the wordplay.
I cannot really understand how this works, but
'container' could be 'spray' (spray is a kind of container) and 'spray' is present in the answer.
'able' could be 'can' and 'can' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for spray can that I've seen before include "one to provide cover with jets" , "put on coat?" , "Aerosol" , "Graffiti artist's equipment" .)