Significant attempt to suppress love, showing prejudice (7)
I believe the answer is:
bigotry
'prejudice' is the definition.
(bigotry means prejudice or discrimination)
'significant attempt to suppress love' is the wordplay.
'significant' becomes 'big' (similar in meaning).
'attempt to' becomes 'try' (I've seen this in other clues).
'suppress' means one lot of letters goes inside another.
'love' becomes 'o' (love means zero in tennis).
'big'+'try'='bigtry'
'bigtry' placed around 'o' is 'BIGOTRY'.
'showing' is the link.
(Other definitions for bigotry that I've seen before include "Intolerant prejudice" , "Intolerance, prejudice on grounds of religion" , "Blind zeal" , "Stubborn prejudice" .)