Man on left I love (6)
I believe the answer is:
liking
'love' is the definition.
(thesaurus)
'man on left i' is the wordplay.
'man' becomes 'king' (man can mean a chess piece).
'on' says to put letters next to each other.
'left' becomes 'l' (common abbreviation).
'l'+'i'='li'
'king' after 'li' is 'LIKING'.
(Other definitions for liking that I've seen before include "Partiality" , "Penchant" , "A feeling of regard or fondness" , "Happy about" , "Taste - preference - affection" .)