Canal worker is a hair fetishist? (10)

I believe the answer is:

lockkeeper

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'canal worker' is the definition.
(I've seen this before)

'hair fetishist?' is the wordplay.
'hair' becomes 'lock' (a lock of hair).
'fetishist?' becomes 'keeper' (I can't explain this - if you can you should believe this answer much more).
'lock'+'keeper'='LOCKKEEPER'

'is a' acts as a link.

Can you help me to learn more?

(Another definition for lockkeeper that I've seen is " Canal worker".)

I've seen this clue in The Guardian.

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