Get back, say, into the shower (6)
I believe the answer is:
regain
'get back' is the definition.
(I've seen this before)
'say into the shower' is the wordplay.
'say' becomes 'eg'.
'into' indicates putting letters inside.
'the shower' becomes 'rain' ('rain shower' can be a synonym of 'shower').
'eg' inserted inside 'rain' is 'REGAIN'.
(Other definitions for regain that I've seen before include "Take back (the Ashes, for example)" , "Recover, retrieve" , "Recover - in gear (anag)" , "Get back, recover the use of" , "Possess once more for regina" .)