With time, maybe dock material (5)

I believe the answer is:

tweed

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'material' is the definition.
(tweed is a kind of material)

'with time maybe dock' is the wordplay.
'with' becomes 'w' (abbreviation).
'time' becomes 't' (abbreviation).
'maybe' is an anagram indicator.
'dock' becomes 'eed' (I am not sure about this - if you are sure you should believe this answer much more).
'w'+'t'='wt'
'wt' is an anagram of 'tw'.
'tw'+'eed'='TWEED'

Can you help me to learn more?

(Other definitions for tweed that I've seen before include "country fabric" , "passes between English and Scottish banks" , "Scottish and English river" , "Running water" , "Rough material" .)

I've seen this clue in The Independent.

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