Eager to change a trend (6)
I believe the answer is:
ardent
'eager' is the definition.
(synonyms)
'change a trend' is the wordplay.
'change' indicates anagramming the letters.
'a'+'trend'='atrend'
'atrend' with letters rearranged gives 'ARDENT'.
'to' acts as a link.
(Other definitions for ardent that I've seen before include "'Fervent, impassioned (6)'" , "Having great warmth of feeling like a lover" , "Burning, passionate" , "Fervid" , "full of zeal" .)