Crossword Genius

It enriches, making a man timelessly secure (6)

Ross

I believe the answer is:

manure

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'it enriches' is the definition.
The definition suggests a singular noun which matches the answer.

'a man timelessly secure' is the wordplay.
'man' becomes 'N' (knight, a man in chess).
'timelessly' becomes 'mure' (I can't justify this - if you can you should give a lot more credence to this answer).
'secure' indicates putting letters inside (inserted letters are secured inside).
'a'+'n'='an'
'an' going into 'mure' is 'MANURE'.

'making' is the link.

Can you help me to learn more?

(Other definitions for manure that I've seen before include "Dung as fertiliser" , "Animal excreta used to fertilise land" , "Fertilizing dung" , "Animal excreta as fertiliser" , "Natural animal fertiliser" .)

I've seen this clue in the Evening Standard.
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