Typical reforms suppressed by Brussels oil producers (9)
I believe the answer is:
eucalypti
'oil producers' is the definition.
(plants which produce eucalyptus oil)
'typical reforms suppressed by brussels' is the wordplay.
'reforms' is an anagram indicator.
'suppressed by' means one lot of letters go next to another.
'brussels' becomes 'EU' (European Parliament is based in Brussels).
'typical' with letters rearranged gives 'calypti'.
'calypti' after 'eu' is 'EUCALYPTI'.
(Other definitions for eucalypti that I've seen before include "Oil sources" , "Australian trees" , "Antipodean natives" , "shrubs" , "Oil producers" .)