I am going after a study in strong fabric (5)
I believe the answer is:
denim
'strong fabric' is the definition.
(I've seen this in another clue)
'i am going after a study' is the wordplay.
'i am' becomes 'I'm' (contraction).
'going after' is a charade indicator (letters next to each other).
'a study' becomes 'den' (term for a study or office).
'im' after 'den' is 'DENIM'.
'in' acts as a link.
(Other definitions for denim that I've seen before include "Material for casual trousers or jackets" , "Mined badly for a hard-wearing fabric" , "Cotton twill fabric" , "Hard-wearing blue fabric" , "Coarse durable twill-weave cotton fabric" .)