Study I'm making of fabric (5)

I believe the answer is:

denim

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

'fabric' is the definition.
(denim is a kind of fabric)

'study i'm making' is the wordplay.
'study' becomes 'den' (term for a study or office).
'i'm' becomes 'i' (I've seen this in other clues).
'making' becomes 'm' (this could be a standard abbreviation of which I'm unaware).
'den'+'i'+'m'='DENIM'

'of' is the link.

Can you help me to learn more?

(Other definitions for denim that I've seen before include "Coloured cotton twill" , "Hard-wearing cotton fabric" , "Material for casual trousers or jackets" , "Tough cotton fabric" , "Cloth for jeans, etc" .)

I've seen this clue in The Globe and Mail.

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