It gives a clearer view in the end to two trees (7)
I believe the answer is:
eyewash
'it gives a clearer view' is the definition.
The definition suggests a singular noun which matches the answer.
'the end to two trees' is the wordplay.
'two trees' can mean two substitutions for 'tree'.
'end' says to take the final letters.
'to' is a charade indicator (letters next to each other).
'tree' becomes 'yew' (type of tree).
'tree' becomes 'ash' (ash is a kind of tree).
The final letter of 'the' is 'e'.
'e'+'yew'+'ash'='EYEWASH'
'in' is the link.
Can you help me to learn more?
(Other definitions for eyewash that I've seen before include "Optic solution to relieve irritation - rubbish!" , "Nonsense (informal)" , "Rhubarb" , "Slangy nonsense or optical cleanser" , "Bunk" .)