Crossword Genius

I work on ways to secure hair - legendary work, we hear (9)

Ross

I believe the answer is:

locksmith

I'm a little stuck... Click here to teach me more about this clue!

'i work' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'ways to secure hair legendary work we hear' is the wordplay.
I cannot really understand how this works, but
'secure' could be 'lock' (locking is a kind of securing) and 'lock' is found within the answer.
The remaining letters 'smith' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'on' acts as a link.

Can you help me to learn more?

(Other definitions for locksmith that I've seen before include "Maker of security devices" , "Yale scholar" , "Maker of secure fasteners" , "Security device maker" , "laughing stock" .)

I've seen this clue in The Independent.
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