A lover's fancy piece (3)
I believe the answer is:
fan
'a lover's' is the definition.
(synonyms)
'fancy piece' is the wordplay.
'fancy' becomes 'fa' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'piece' becomes 'n' (abbreviation for Knight in chess notation).
'fa'+'n'='FAN'
Can you help me to learn more?
(Other definitions for fan that I've seen before include "Great enthusiast" , "Devotee; ventilator" , "Keen follower; cooler" , "Manual cooling device - for admirer?" , "Spanish women wave it to cool themselves" .)