Met Rose in shower to get wetter (9)

I believe the answer is:

moistener

'wetter' is the definition.
(I've seen this before)

'met rose in shower' is the wordplay.
'shower' is an anagram indicator.
'met'+'rose'+'in'='metrosein'
'metrosein' is an anagram of 'MOISTENER'.

'to get' acts as a link.

(Other definitions for moistener that I've seen before include "wetter" , "sort of cream" .)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app