Advanced equipment in Welsh town will do for flowering plant (8)
I believe the answer is:
marigold
'flowering plant' is the definition.
(I know that marigold is a type of flowering plant)
'advanced equipment in welsh town' is the wordplay.
'advanced' becomes 'a' (abbreviation).
'equipment' becomes 'rig' (rig is a kind of equipment).
'in' indicates putting letters inside.
'welsh town' becomes 'mold'.
'a'+'rig'='arig'
'arig' going inside 'mold' is 'MARIGOLD'.
'will do for' acts as a link.
(Other definitions for marigold that I've seen before include "floral item" , "Composite plant" , "Orange-flowered plant" , "Yellow or orange flower" , "Bright orange-yellow garden flower" .)