He should show the way to a raving lunatic (9)

I believe the answer is:

navigator

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'he should show the way' 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'.

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(Other definitions for navigator that I've seen before include "One who plots a course" , "Marine explorer" , "Person steering course" , "Pilot" , "sailor" .)

I've seen this clue in The Globe and Mail.

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