Penchant (6)
I believe the answer is:
liking
'penchant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for liking that I've seen before include "Being in favour (of)" , "Taste - preference - affection" , "Fondness (for thing)" , "Partiality" , "A feeling of regard or fondness" .)