It shows the way to a shark (7)
I believe the answer is:
pointer
This might be a double definition.
'it shows the way' is the first definition.
The definition suggests a singular noun which matches the answer.
'shark' is the second definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'to a' is the link.
Can you help me to learn more?
(Other definitions for pointer that I've seen before include "Tip; dog" , "Arrow" , "The dog provides an indication" , "Guide" , "something moved by mouse" .)