Fast to get answer - I will see it ahead in the road (9)
I believe the answer is:
taillight
'it ahead in the road' is the definition.
The definition suggests a singular noun which matches the answer.
'fast to get answer i will' is the wordplay.
'fast' becomes 'tight' (I've seen this before).
'to get' means one lot of letters goes inside another.
'answer' becomes 'a' (abbreviation eg in Q and A).
'i will' becomes 'ill' (I've seen this before).
'a'+'ill'='aill'
'tight' enclosing 'aill' is 'TAILLIGHT'.
'see' is the link.
Can you help me to learn more?
(Another definition for taillight that I've seen is " Illumination at rear of vehicle".)