Smear most of material for jacket? (4)

I believe the answer is:

blur

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'smear' is the definition.
(I know that smear can be written as blur)

'most of material for jacket?' is the wordplay.
'most of' means to remove the last letter.
'material' becomes 'blue' (blue is a kind of material).
'for jacket?' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'blue' with its final letter taken away is 'blu'.
'blu'+'r'='BLUR'

Can you help me to learn more?

(Other definitions for blur that I've seen before include "murky spot" , "Make less distinct" , "Indistinct appearance like smear" , "Indistinct object - smudge" , "Britpop band - indistinct vision" .)

I've seen this clue in The Independent.

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