Dog seen in shower (7)
I believe the answer is:
pointer
'dog' is the definition.
(pointer is a kind of dog)
'in shower' is the wordplay.
I cannot really see how this works, but
'in' is within the answer.
This explanation may well be incorrect...
'seen' is the link.
Can you help me to learn more?
(Other definitions for pointer that I've seen before include "Signpost - dog" , "Gun dog" , "Suggestion" , "helpful tip!" , "stick used for instruction?" .)