A beer in a boat (5)
I believe the answer is:
tinny
'a beer in' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tinny that I've seen before include "insubstantial" , "Cheap" , "appear so badly constructed?" , "Made of poor metal" , "Sounding thin and metallic" .)