One giving a steer to a raving lunatic (9)

I believe the answer is:

navigator

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'one giving a steer' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'to a raving lunatic' is the wordplay.
'lunatic' is an anagram indicator.
'to'+'a'+'raving'='toaraving'
'toaraving' anagrammed gives 'NAVIGATOR'.

Can you help me to learn more?

(Other definitions for navigator that I've seen before include "reliable guide" , "For example, Henry" , "crew member" , "course director" , "One who plots a course" .)

I've seen this clue in The Independent.

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