Be honest, what do you do in the shower? (4,5)
I believe the answer is:
come clean
'do you do in the shower?' is the definition.
I know nothing about this answer so I can't tell whether this works.
'be honest' is the wordplay.
'be' becomes 'come' (coming is a kind of being).
'honest' becomes 'clean' (I've seen this before).
'come'+'clean'='COME CLEAN'
'what' is the link.
Can you help me to learn more?
(Other definitions for come clean that I've seen before include "Admit" , "Be completely honest" , "Confess fully or arrive after ablutions" , "Fully confess something" , "how you hope your home delivery laundry will arrive" .)