Make lead rub off fast (7)

I believe the answer is:

durable

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

'off fast' is the definition.
'durable' can be an answer for 'fast' (thesaurus). I'm not certain of the 'off' bit.

'make lead rub' is the wordplay.
'make' indicates an anagram.
'lead'+'rub'='leadrub'
'leadrub' anagrammed gives 'DURABLE'.

Can you help me to learn more?

(Other definitions for durable that I've seen before include "Good" , "Hardy" , "Likely to last" , "existing for a long time" , "Firm" .)

I've seen this clue in the Sydney Morning Herald.

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