Sequence featuring in advert for brewing equipment (3-8)
I believe the answer is:
tea-strainer
'brewing equipment' is the definition.
'sequence featuring in advert' is the wordplay.
'sequence' becomes 'train' (I've seen this before).
'featuring in' is an insertion indicator.
'advert' becomes 'teaser' (teaser is a type of advert).
'train' going within 'teaser' is 'TEA-STRAINER'.
'for' acts as a link.
(Other definitions for tea-strainer that I've seen before include "Catcher of leaves" , "What stops leaves getting through" .)